diff --git a/wp-admin/css/customize-controls-rtl.css b/wp-admin/css/customize-controls-rtl.css
index 16e3ca7a90..0e7a7702f2 100644
--- a/wp-admin/css/customize-controls-rtl.css
+++ b/wp-admin/css/customize-controls-rtl.css
@@ -945,21 +945,16 @@ p.customize-section-description {
 	right: 100%;
 }
 
-.themes-panel-back:before {
-	top: 13px;
+.in-themes-panel .control-panel-back:before {
+	content: "\f341";
 	right: 14px;
 }
 
-.in-themes-panel .themes-panel-back {
+.in-themes-panel .control-panel-back {
 	right: 0;
 }
 
-.in-sub-panel .themes-panel-back {
-	display: none;
-}
-
-.control-panel-back.themes-panel-back:before {
-	content: "\f341";
+.in-themes-panel .control-panel-back:before {
 }
 
 /* Details View */
diff --git a/wp-admin/css/customize-controls-rtl.min.css b/wp-admin/css/customize-controls-rtl.min.css
index 09c816d390..eabbfcafdd 100644
--- a/wp-admin/css/customize-controls-rtl.min.css
+++ b/wp-admin/css/customize-controls-rtl.min.css
@@ -1 +1 @@
-body{overflow:hidden;-webkit-text-size-adjust:100%}#customize-controls a{text-decoration:none}#customize-controls h3{font-size:14px}#customize-controls img{max-width:100%}#customize-controls .submit{text-align:center}#customize-controls .description{color:#666}#customize-header-actions .button-primary{float:left;margin-top:9px}#customize-header-actions .spinner{margin-top:16px;margin-left:4px}.saving #customize-header-actions .spinner{display:block}#customize-header-actions{border-bottom:1px solid #ddd}#customize-controls .wp-full-overlay-sidebar-content{overflow-y:auto;overflow-x:hidden}#customize-info{border:none;border-top:1px solid #ddd}#customize-info .accordion-section-title{background-color:#fff;color:#666;border-right:none;border-left:none;border-bottom:1px solid #eee}#customize-info .accordion-section-title:focus:after,#customize-info .accordion-section-title:hover:after,#customize-info.open .accordion-section-title:after{color:#555}#customize-info .preview-notice{font-size:13px;line-height:24px}#customize-info .theme-name{font-size:20px;font-weight:200;line-height:24px;display:block}#customize-info .theme-screenshot{width:258px}#customize-info .theme-description{margin-top:1em;color:#666;line-height:20px}#customize-theme-controls .control-section{border:none}#customize-theme-controls .accordion-section-title{color:#555;background-color:#fff;border-bottom:1px solid #eee}#customize-theme-controls .accordion-section-content{color:#555;background:#fff}#customize-info .accordion-section-title:focus,#customize-info .accordion-section-title:hover,#customize-info.open .accordion-section-title,#customize-theme-controls .control-section .accordion-section-title:focus,#customize-theme-controls .control-section .accordion-section-title:hover,#customize-theme-controls .control-section.open .accordion-section-title,#customize-theme-controls .control-section:hover>.accordion-section-title{color:#222;background:#f5f5f5}.js .control-section .accordion-section-title:focus,.js .control-section .accordion-section-title:hover,.js .control-section.open .accordion-section-title,.js .control-section:hover .accordion-section-title{background:#f5f5f5}#customize-theme-controls .control-section .accordion-section-title:focus:after,#customize-theme-controls .control-section .accordion-section-title:hover:after,#customize-theme-controls .control-section.open .accordion-section-title:after,#customize-theme-controls .control-section:hover>.accordion-section-title:after{color:#555}#customize-info.open,#customize-theme-controls .control-section.open{border-bottom:1px solid #eee}#customize-theme-controls .control-section.open .accordion-section-title{border-bottom-color:#eee!important}#customize-theme-controls .control-section:last-of-type.open,#customize-theme-controls .control-section:last-of-type>.accordion-section-title{border-bottom-color:#ddd}#customize-theme-controls 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.accordion-sub-container.control-panel-content{width:100%}.customize-controls-close{display:block;position:absolute;top:0;right:0;width:45px;height:45px;padding-left:2px;background:#eee;border-left:1px solid #ddd;color:#444;cursor:pointer;-webkit-transition:color .1s ease-in-out,background .1s ease-in-out;transition:color .1s ease-in-out,background .1s ease-in-out}.control-panel-back{display:block;position:fixed;top:0;z-index:99;right:-48px;width:45px;height:45px;padding-left:2px;background:#eee;border-left:1px solid #ddd;cursor:pointer;-webkit-transition:right .18s ease-in-out,color .1s ease-in-out,background .1s ease-in-out;transition:right .18s ease-in-out,color .1s ease-in-out,background .1s ease-in-out}.collapsed .control-panel-back{display:none}.control-panel-back:focus,.control-panel-back:hover,.customize-controls-close:focus,.customize-controls-close:hover,.customize-controls-preview-toggle:focus,.customize-controls-preview-toggle:hover{background:#ddd;border-color:#ccc;color:#000;outline:0;-webkit-box-shadow:none;box-shadow:none}.customize-controls-close:before{font:400 22px/1 dashicons;content:"\f335";position:relative;top:7px;right:13px}.control-panel-back:before{font:400 20px/1 dashicons;content:"\f345";position:relative;top:7px;right:13px}.in-sub-panel .control-panel-back{right:0}.current-panel>.accordion-section-title{height:22px}.wp-full-overlay-sidebar .wp-full-overlay-header{-webkit-transition:padding ease-in-out .18s;transition:padding ease-in-out .18s}.in-sub-panel .wp-full-overlay-sidebar .wp-full-overlay-header{padding-right:62px}#customize-info,#customize-theme-controls>ul>.accordion-section{position:relative;right:0;-webkit-transition:right ease-in-out .18s;transition:right 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select{line-height:28px}.customize-control input[type=email],.customize-control input[type=number],.customize-control input[type=password],.customize-control input[type=search],.customize-control input[type=tel],.customize-control input[type=text],.customize-control input[type=url]{width:98%;line-height:18px;margin:0}.customize-control-hidden{margin:0}.customize-control-textarea textarea{width:100%;resize:vertical}.customize-control select{min-width:50%;max-width:100%;height:28px;line-height:28px}.customize-control select[multiple]{height:auto}.customize-control-title{display:block;font-size:14px;line-height:24px;font-weight:600;margin-bottom:5px}.customize-control-description{display:block;font-style:italic;line-height:18px;margin-bottom:5px}.customize-control-checkbox label,.customize-control-color .color-picker,.customize-control-upload div{line-height:28px}.customize-control-checkbox input{margin-left:5px}.customize-control-radio{padding:5px 0 10px}.customize-control-radio .customize-control-title{margin-bottom:0;line-height:22px}.customize-control-radio .customize-control-title+.customize-control-description{margin-top:7px}.customize-control-radio label{line-height:32px}.customize-control-radio input{margin-left:5px}.customize-control .attachment-thumb.type-icon{float:right;margin:10px;width:auto}.customize-control .attachment-title{font-weight:700;margin:0;padding:5px 10px}.customize-control .attachment-meta{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin:0;padding:0 10px}.customize-control .attachment-meta-title{padding-top:7px}.customize-control .thumbnail-image{line-height:0}.customize-control .thumbnail-image img{cursor:pointer}#customize-controls .thumbnail-audio .thumbnail{max-width:64px;max-height:64px;margin:10px;float:right}#customize-preview iframe{width:100%;height:100%}.wp-full-overlay-sidebar{background:#eee;border-left:1px solid 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.theme-wrap{right:0;left:0;top:0;bottom:0}}body.cheatin{font-size:medium;height:auto;background:#fff;margin:50px auto 2em;padding:1em 2em;max-width:700px;min-width:0;-webkit-box-shadow:0 1px 3px rgba(0,0,0,.13);box-shadow:0 1px 3px rgba(0,0,0,.13)}body.cheatin p{font-size:14px;line-height:1.5;margin:25px 0 20px}.customize-controls-preview-toggle{display:none}@media only screen and (max-width:780px){.wp-customizer .theme:not(.active):focus .theme-actions,.wp-customizer .theme:not(.active):hover .theme-actions{display:block}}@media screen and (max-width:640px){#customize-controls{width:100%}.wp-full-overlay.expanded{margin-right:0}.wp-full-overlay-sidebar .wp-full-overlay-sidebar-content{bottom:0}.customize-controls-preview-toggle{display:block;position:absolute;top:0;right:48px;line-height:45px;font-size:14px;padding:0 12px;margin:0;height:45px;background:#eee;border-left:1px solid #ddd;color:#444;cursor:pointer;-webkit-transition:color .1s ease-in-out,background .1s 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\ No newline at end of file
+body{overflow:hidden;-webkit-text-size-adjust:100%}#customize-controls a{text-decoration:none}#customize-controls h3{font-size:14px}#customize-controls img{max-width:100%}#customize-controls .submit{text-align:center}#customize-controls .description{color:#666}#customize-header-actions .button-primary{float:left;margin-top:9px}#customize-header-actions .spinner{margin-top:16px;margin-left:4px}.saving #customize-header-actions .spinner{display:block}#customize-header-actions{border-bottom:1px solid #ddd}#customize-controls .wp-full-overlay-sidebar-content{overflow-y:auto;overflow-x:hidden}#customize-info{border:none;border-top:1px solid #ddd}#customize-info .accordion-section-title{background-color:#fff;color:#666;border-right:none;border-left:none;border-bottom:1px solid #eee}#customize-info .accordion-section-title:focus:after,#customize-info .accordion-section-title:hover:after,#customize-info.open .accordion-section-title:after{color:#555}#customize-info 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\ No newline at end of file
diff --git a/wp-admin/css/customize-controls.css b/wp-admin/css/customize-controls.css
index ea6c9eae75..030e02edcc 100644
--- a/wp-admin/css/customize-controls.css
+++ b/wp-admin/css/customize-controls.css
@@ -945,21 +945,16 @@ p.customize-section-description {
 	left: 100%;
 }
 
-.themes-panel-back:before {
-	top: 13px;
+.in-themes-panel .control-panel-back:before {
+	content: "\f345";
 	left: 14px;
 }
 
-.in-themes-panel .themes-panel-back {
+.in-themes-panel .control-panel-back {
 	left: 0;
 }
 
-.in-sub-panel .themes-panel-back {
-	display: none;
-}
-
-.control-panel-back.themes-panel-back:before {
-	content: "\f345";
+.in-themes-panel .control-panel-back:before {
 }
 
 /* Details View */
diff --git a/wp-admin/css/customize-controls.min.css b/wp-admin/css/customize-controls.min.css
index 481f3414a9..1ac3e8a8aa 100644
--- a/wp-admin/css/customize-controls.min.css
+++ b/wp-admin/css/customize-controls.min.css
@@ -1 +1 @@
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#ddd}.collapse-sidebar{background-color:transparent!important;border:none!important;-webkit-box-shadow:none!important;box-shadow:none!important;-webkit-border-radius:0!important;border-radius:0!important}.collapse-sidebar:active,.collapse-sidebar:active .collapse-sidebar-arrow:before,.collapse-sidebar:active .collapse-sidebar-label{text-shadow:none}.collapsed .collapse-sidebar-arrow:before{color:#888}.accordion-section .dropdown{float:left;display:block;position:relative;cursor:pointer}.accordion-section .dropdown-content{overflow:hidden;float:left;min-width:30px;height:16px;line-height:16px;margin-right:16px;padding:4px 5px;border:2px solid #eee;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.customize-control .dropdown-arrow{position:absolute;top:0;bottom:0;right:0;width:20px;background:#eee}.customize-control .dropdown-arrow:after{content:"\f140";font:400 20px/1 dashicons;speak:none;display:block;padding:0;text-indent:0;text-align:center;position:relative;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-decoration:none!important;color:#333}.customize-control .dropdown-status{color:#333;background:#eee;display:none;max-width:112px}.customize-control-color .color-picker-hex{display:none}.customize-control-color.open .color-picker-hex{display:block}.customize-control-color .dropdown{margin-right:5px;margin-bottom:5px}.customize-control-color .dropdown .dropdown-content{background-color:#555;border:1px solid rgba(0,0,0,.15)}.customize-control-color .dropdown:hover .dropdown-content{border-color:rgba(0,0,0,.25)}.ios #customize-preview,.ios .wp-full-overlay{position:relative}.ios #customize-controls .wp-full-overlay-sidebar-content{-webkit-overflow-scrolling:touch}.customize-control-background .current,.customize-control-header .current,.customize-control-image .current,.customize-control-media 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.upload-button{white-space:normal;width:48%;height:auto}.customize-control-background .current .container,.customize-control-header .current .container,.customize-control-image .current .container,.customize-control-media .current .container,.customize-control-upload .current .container{overflow:hidden;border:1px solid #eee;-webkit-border-radius:2px;border-radius:2px}.customize-control-background .current .container,.customize-control-image .current .container,.customize-control-media .current .container,.customize-control-upload .current .container{min-height:40px}.customize-control-background .placeholder,.customize-control-header .placeholder,.customize-control-image .placeholder,.customize-control-media .placeholder,.customize-control-upload .placeholder{width:100%;position:relative;text-align:center;cursor:default}.customize-control-background .inner,.customize-control-header .inner,.customize-control-image .inner,.customize-control-media .inner,.customize-control-upload .inner{display:none;position:absolute;width:100%;color:#555;white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.customize-control-background .inner,.customize-control-image .inner,.customize-control-media .inner,.customize-control-upload .inner{display:block;min-height:40px}.customize-control-background .inner,.customize-control-header .inner,.customize-control-header .inner .dashicons,.customize-control-image .inner,.customize-control-media .inner,.customize-control-upload .inner{line-height:20px;top:10px}.customize-control-header .list .inner,.customize-control-header .list .inner .dashicons{top:9px}.customize-control-header .header-view{position:relative;width:100%;margin-bottom:5px}.customize-control-header .header-view:last-child{margin-bottom:0}.customize-control-header .header-view:after{border:0}.customize-control-header .header-view.selected:after{content:'';position:absolute;height:auto;top:0;left:0;bottom:0;right:0;border:4px solid #2ea2cc;-webkit-border-radius:2px;border-radius:2px}.customize-control-header .header-view.button.selected{border:0}.customize-control-header .uploaded .header-view .close{font-size:2em;color:grey;position:absolute;visibility:hidden;top:10px;right:10px;z-index:1;width:20px;height:20px;cursor:pointer}.customize-control-header .uploaded .header-view .close:hover{color:#000;text-shadow:-1px -1px 0 #fff,1px -1px 0 #fff,-1px 1px 0 #fff,1px 1px 0 #fff}.customize-control-header .header-view:hover .close{visibility:visible}.customize-control-header .random.placeholder{cursor:pointer;-webkit-border-radius:2px;border-radius:2px;height:40px}.customize-control-header button.random{width:100%;height:auto;min-height:40px;white-space:normal}.customize-control-header button.random .dice{margin-top:4px}.customize-control-header .header-view:hover>button.random .dice,.customize-control-header .placeholder:hover .dice{-webkit-animation:dice-color-change 3s infinite;animation:dice-color-change 3s infinite}@-webkit-keyframes dice-color-change{0%{color:#d4b146}50%{color:#ef54b0}75%{color:#7190d3}100%{color:#d4b146}}@keyframes dice-color-change{0%{color:#d4b146}50%{color:#ef54b0}75%{color:#7190d3}100%{color:#d4b146}}.customize-control-background .actions,.customize-control-header .actions,.customize-control-image .actions,.customize-control-media .actions,.customize-control-upload .actions{margin-bottom:32px}.customize-control-header .choice{position:relative;display:block;margin-bottom:9px}.customize-control-header .uploaded div:last-child>.choice{margin-bottom:0}.customize-control-background img,.customize-control-header img,.customize-control-image img,.customize-control-media img,.customize-control-upload img{width:100%;-webkit-border-radius:2px;border-radius:2px}.customize-control-background .default-button,.customize-control-background .remove-button,.customize-control-header .remove,.customize-control-image .default-button,.customize-control-image .remove-button,.customize-control-media .default-button,.customize-control-media .remove-button,.customize-control-upload .default-button,.customize-control-upload .remove-button{float:left;margin-right:3px}.customize-control-background .upload-button,.customize-control-header .new,.customize-control-image .upload-button,.customize-control-media .upload-button,.customize-control-upload .upload-button{float:right}@-webkit-keyframes customize-reload{0%{opacity:0}100%{opacity:1}}@keyframes customize-reload{0%{opacity:0}100%{opacity:1}}.wp-customizer .customize-loading #customize-container{display:block;-webkit-animation:customize-reload .75s;animation:customize-reload .75s}.customize-themes-panel{display:none;padding:0 8px;background:#f1f1f1;box-sizing:border-box;-webkit-box-sizing:border-box;-moz-box-sizing:border-box}.control-section.open .customize-themes-panel{display:block}#customize-theme-controls .customize-themes-panel .accordion-section-content{background:0 0;display:block}.customize-control.customize-control-theme{margin-bottom:8px}.wp-customizer .theme-browser .themes{padding-bottom:8px}.wp-customizer .theme-browser .theme{margin:0;width:100%}.wp-customizer .theme-browser .theme .theme-actions{-ms-filter:"alpha(Opacity=100)";opacity:1}#customize-controls h3.theme-name{font-size:15px}#customize-controls .theme-overlay .theme-name{font-size:32px}.wp-customizer .theme-browser .theme.active .theme-name{padding-right:15px}.wp-customizer #themes-filter{font-size:16px;font-weight:300;line-height:1.5;width:100%}#accordion-section-themes .accordion-section-title:after{content:"\f148"}.rtl #accordion-section-themes .accordion-section-title:after{-webkit-transform:rotate(180deg);-ms-transform:rotate(180deg);transform:rotate(180deg)}#customize-theme-controls .control-section-themes.current-panel>h3.accordion-section-title{left:0}.customize-themes-panel.control-panel-content{position:absolute;left:-100%;top:0;width:100%;border-top:1px solid #ddd}.in-themes-panel #customize-info,.in-themes-panel #customize-theme-controls>ul>.accordion-section{left:100%}.in-themes-panel .control-panel-back:before{content:"\f345";left:14px}.in-themes-panel .control-panel-back{left:0}.wp-customizer .theme-overlay{display:none}.wp-customizer.modal-open .theme-overlay{position:fixed;left:0;top:0;right:0;bottom:0;z-index:109}.wp-customizer .theme-overlay .theme-backdrop{background:rgba(238,238,238,.75);position:fixed;z-index:110}.wp-customizer .theme-overlay .theme-wrap{left:90px;right:90px;top:45px;bottom:45px;z-index:120;max-width:1740px}.wp-customizer .theme-overlay .theme-actions{text-align:right}.modal-open .in-themes-panel #customize-controls .wp-full-overlay-sidebar-content{overflow:visible}@media (max-width:850px),(max-height:472px){.wp-customizer .theme-overlay .theme-wrap{left:0;right:0;top:0;bottom:0}}body.cheatin{font-size:medium;height:auto;background:#fff;margin:50px auto 2em;padding:1em 2em;max-width:700px;min-width:0;-webkit-box-shadow:0 1px 3px rgba(0,0,0,.13);box-shadow:0 1px 3px rgba(0,0,0,.13)}body.cheatin p{font-size:14px;line-height:1.5;margin:25px 0 20px}.customize-controls-preview-toggle{display:none}@media only screen and (max-width:780px){.wp-customizer .theme:not(.active):focus .theme-actions,.wp-customizer .theme:not(.active):hover .theme-actions{display:block}}@media screen and (max-width:640px){#customize-controls{width:100%}.wp-full-overlay.expanded{margin-left:0}.wp-full-overlay-sidebar .wp-full-overlay-sidebar-content{bottom:0}.customize-controls-preview-toggle{display:block;position:absolute;top:0;left:48px;line-height:45px;font-size:14px;padding:0 12px;margin:0;height:45px;background:#eee;border-right:1px solid #ddd;color:#444;cursor:pointer;-webkit-transition:color .1s ease-in-out,background .1s ease-in-out;transition:color .1s ease-in-out,background .1s ease-in-out}#customize-footer-actions,#customize-preview,.customize-controls-preview-toggle .controls,.preview-only .customize-controls-preview-toggle .preview,.preview-only .wp-full-overlay-sidebar-content{display:none}.customize-controls-preview-toggle .controls:before,.customize-controls-preview-toggle .preview:before{font:400 20px/1 dashicons;content:"\f177";position:relative;top:4px;margin-right:6px}.customize-controls-preview-toggle .controls:before{content:"\f100"}.preview-only #customize-controls{height:45px}.preview-only #customize-preview,.preview-only .customize-controls-preview-toggle .controls{display:block}#customize-preview{top:45px;bottom:0;height:auto}.wp-core-ui.wp-customizer .button{padding:6px 14px;line-height:normal;font-size:14px;vertical-align:middle;height:auto;margin-bottom:4px}#customize-header-actions .button-primary{margin-top:6px}#customize-header-actions .spinner{margin-top:13px}}
\ No newline at end of file
diff --git a/wp-admin/js/customize-controls.js b/wp-admin/js/customize-controls.js
index 1cd2ded387..86cb94954c 100644
--- a/wp-admin/js/customize-controls.js
+++ b/wp-admin/js/customize-controls.js
@@ -598,14 +598,17 @@
 				}
 			});
 
-			section.container.find( '.themes-panel-back' ).on( 'click keydown', function( event ) {
+
+			$( '#customize-header-actions' ).on( 'click keydown', '.control-panel-back', function( event ) {
 				if ( api.utils.isKeydownButNotEnterEvent( event ) ) {
 					return;
 				}
 
 				event.preventDefault(); // Keep this AFTER the key filter above
 
-				section.collapse();
+				if ( section.expanded() ) {
+					section.collapse();
+				}
 			});
 
 			// Theme navigation in details view.
@@ -691,7 +694,7 @@
 				container = section.closest( '.wp-full-overlay-sidebar-content' ),
 				siblings = container.find( '.open' ),
 				topPanel = overlay.find( '#customize-theme-controls > ul > .accordion-section > .accordion-section-title' ).add( '#customize-info > .accordion-section-title' ),
-				backBtn = overlay.find( '.themes-panel-back' ),
+				backBtn = overlay.find( '.control-panel-back' ),
 				panelTitle = section.find( '.accordion-section-title' ).first(),
 				content = section.find( '.control-panel-content' );
 
diff --git a/wp-admin/js/customize-controls.min.js b/wp-admin/js/customize-controls.min.js
index af60503ca2..64a68d97cf 100644
--- a/wp-admin/js/customize-controls.min.js
+++ b/wp-admin/js/customize-controls.min.js
@@ -1,2 +1,2 @@
-!function(a,b){var c,d,e=wp.customize;e.Setting=e.Value.extend({initialize:function(a,b,c){e.Value.prototype.initialize.call(this,b,c),this.id=a,this.transport=this.transport||"refresh",this._dirty=c.dirty||!1,this.bind(this.preview)},preview:function(){switch(this.transport){case"refresh":return this.previewer.refresh();case"postMessage":return this.previewer.send("setting",[this.id,this()])}}}),e.utils={},e.utils.bubbleChildValueChanges=function(a,c){b.each(c,function(b,c){a[c].bind(function(b,c){a.parent&&b!==c&&a.parent.trigger("change",a)})})},d=function(a){var b,c,d;b=this,a=a||{},d=function(){b.container.find(":focusable:first").focus(),b.container[0].scrollIntoView(!0)},a.completeCallback?(c=a.completeCallback,a.completeCallback=function(){d(),c()}):a.completeCallback=d,b.expand?b.expand(a):a.completeCallback()},e.utils.prioritySort=function(a,b){return a.priority()===b.priority()&&"number"==typeof a.params.instanceNumber&&"number"==typeof b.params.instanceNumber?a.params.instanceNumber-b.params.instanceNumber:a.priority()-b.priority()},e.utils.isKeydownButNotEnterEvent=function(a){return"keydown"===a.type&&13!==a.which},e.utils.areElementListsEqual=function(a,c){var d=a.length===c.length&&-1===_.indexOf(_.map(_.zip(a,c),function(a){return b(a[0]).is(a[1])}),!1);return d},c=e.Class.extend({defaultActiveArguments:{duration:"fast",completeCallback:b.noop},defaultExpandedArguments:{duration:"fast",completeCallback:b.noop},initialize:function(a,c){var d=this;d.id=a,d.params={},b.extend(d,c||{}),d.container=b(d.params.content),d.deferred={embedded:new b.Deferred},d.priority=new e.Value,d.active=new e.Value,d.activeArgumentsQueue=[],d.expanded=new e.Value,d.expandedArgumentsQueue=[],d.active.bind(function(a){var c=d.activeArgumentsQueue.shift();c=b.extend({},d.defaultActiveArguments,c),a=a&&d.isContextuallyActive(),d.onChangeActive(a,c)}),d.expanded.bind(function(a){var c=d.expandedArgumentsQueue.shift();c=b.extend({},d.defaultExpandedArguments,c),d.onChangeExpanded(a,c)}),d.attachEvents(),e.utils.bubbleChildValueChanges(d,["priority","active"]),d.priority.set(isNaN(d.params.priority)?100:d.params.priority),d.active.set(d.params.active),d.expanded.set(!1)},ready:function(){},_children:function(a,b){var c=this,d=[];return e[b].each(function(b){b[a].get()===c.id&&d.push(b)}),d.sort(e.utils.prioritySort),d},isContextuallyActive:function(){throw new Error("Container.isContextuallyActive() must be overridden in a subclass.")},onChangeActive:function(a,c){var d="resolved"===e.previewer.deferred.active.state()?c.duration:0;b.contains(document,this.container)?a?this.container.stop(!0,!0).slideDown(d,c.completeCallback):this.container.stop(!0,!0).slideUp(d,c.completeCallback):(this.container.toggle(a),c.completeCallback&&c.completeCallback())},_toggleActive:function(a,b){var c=this;return b=b||{},a&&this.active.get()||!a&&!this.active.get()?(b.unchanged=!0,c.onChangeActive(c.active.get(),b),!1):(b.unchanged=!1,this.activeArgumentsQueue.push(b),this.active.set(a),!0)},activate:function(a){return this._toggleActive(!0,a)},deactivate:function(a){return this._toggleActive(!1,a)},onChangeExpanded:function(){throw new Error("Must override with subclass.")},_toggleExpanded:function(a,b){var c=this;b=b||{};var d=this,e=b.completeCallback;return b.completeCallback=function(){e&&e.apply(d,arguments),d.container.trigger(a?"expanded":"collapsed")},a&&this.expanded.get()||!a&&!this.expanded.get()?(b.unchanged=!0,c.onChangeExpanded(c.expanded.get(),b),!1):(b.unchanged=!1,this.expandedArgumentsQueue.push(b),this.expanded.set(a),!0)},expand:function(a){return this._toggleExpanded(!0,a)},collapse:function(a){return this._toggleExpanded(!1,a)},focus:d}),e.Section=c.extend({initialize:function(a,d){var f=this;c.prototype.initialize.call(f,a,d),f.id=a,f.panel=new e.Value,f.panel.bind(function(a){b(f.container).toggleClass("control-subsection",!!a)}),f.panel.set(f.params.panel||""),e.utils.bubbleChildValueChanges(f,["panel"]),f.embed(),f.deferred.embedded.done(function(){f.ready()})},embed:function(){var a,c=this;a=function(a){var d;a?e.panel(a,function(a){a.deferred.embedded.done(function(){d=a.container.find("ul:first"),c.container.parent().is(d)||d.append(c.container),c.deferred.embedded.resolve()})}):(d=b("#customize-theme-controls").children("ul"),c.container.parent().is(d)||d.append(c.container),c.deferred.embedded.resolve())},c.panel.bind(a),a(c.panel.get())},attachEvents:function(){var a=this;a.container.find(".accordion-section-title").on("click keydown",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.expanded()?a.collapse():a.expand())})},isContextuallyActive:function(){var a=this,b=a.controls(),c=0;return _(b).each(function(a){a.active()&&(c+=1)}),0!==c},controls:function(){return this._children("section","control")},onChangeExpanded:function(a,b){var c,d=this,f=d.container.find(".accordion-section-content");a?(c=b.unchanged?b.completeCallback:function(){f.stop().slideDown(b.duration,b.completeCallback),d.container.addClass("open")},b.allowMultiple||e.section.each(function(a){a!==d&&a.collapse({duration:b.duration})}),d.panel()?e.panel(d.panel()).expand({duration:b.duration,completeCallback:c}):c()):(d.container.removeClass("open"),f.slideUp(b.duration,b.completeCallback))}}),e.ThemesSection=e.Section.extend({currentTheme:"",overlay:"",template:"",ready:function(){var a=this;a.overlay=a.container.find(".theme-overlay"),a.template=wp.template("customize-themes-details-view"),b("body").on("keyup",function(b){a.overlay.find(".theme-wrap").is(":visible")&&(39===b.keyCode&&a.nextTheme(),37===b.keyCode&&a.previousTheme(),27===b.keyCode&&a.closeDetails())})},attachEvents:function(){var a=this;a.container.find(".accordion-section-title").on("click keydown",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.expanded()?a.collapse():a.expand())}),a.container.find(".themes-panel-back").on("click keydown",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.collapse())}),a.container.on("click keydown",".left",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.previousTheme())}),a.container.on("click keydown",".right",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.nextTheme())}),a.container.on("click keydown",".theme-backdrop, .close",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.closeDetails())}),a.container.on("click keydown",".theme-actions .button",function(a){e.utils.isKeydownButNotEnterEvent(a)||b(".wp-full-overlay").addClass("customize-loading")}),a.container.on("input","#themes-filter",function(b){var c,d=b.currentTarget.value.toLowerCase().trim().replace("-"," "),e=a.controls();e.pop(),_.each(e,function(a){a.filter(d)}),c=a.container.find("li.customize-control:visible").length,a.container.find(".theme-count").text(c)})},onChangeExpanded:function(a,b){if(b.unchanged)return void(b.completeCallback&&b.completeCallback());var c,d,f=this,g=f.container.closest(".accordion-section"),h=g.closest(".wp-full-overlay"),i=g.closest(".wp-full-overlay-sidebar-content"),j=i.find(".open"),k=h.find("#customize-theme-controls > ul > .accordion-section > .accordion-section-title").add("#customize-info > .accordion-section-title"),l=h.find(".themes-panel-back"),m=g.find(".accordion-section-title").first(),n=g.find(".control-panel-content");a?(e.section.each(function(a){a!==f&&a.collapse({duration:b.duration})}),e.panel.each(function(a){f!==a&&a.collapse({duration:0})}),n.show(0,function(){c=n.offset().top,d=i.scrollTop(),n.css("margin-top",45-c-d),g.addClass("current-panel"),h.addClass("in-themes-panel"),i.scrollTop(0),b.completeCallback&&b.completeCallback()}),k.attr("tabindex","-1"),l.attr("tabindex","0"),l.focus()):(j.removeClass("open"),g.removeClass("current-panel"),h.removeClass("in-themes-panel"),n.delay(180).hide(0,function(){n.css("margin-top","inherit"),b.completeCallback&&b.completeCallback()}),k.attr("tabindex","0"),l.attr("tabindex","-1"),m.focus(),i.scrollTop(0))},nextTheme:function(){var a=this;a.getNextTheme()&&a.showDetails(a.getNextTheme(),function(){a.overlay.find(".right").focus()})},getNextTheme:function(){var a,b;return a=e.control("theme_"+this.currentTheme),b=a.container.next("li.customize-control-theme"),b.length?(b=b[0].id.replace("customize-control-",""),a=e.control(b),a.params.theme):!1},previousTheme:function(){var a=this;a.getPreviousTheme()&&a.showDetails(a.getPreviousTheme(),function(){a.overlay.find(".left").focus()})},getPreviousTheme:function(){var a,b;return a=e.control("theme_"+this.currentTheme),b=a.container.prev("li.customize-control-theme"),b.length?(b=b[0].id.replace("customize-control-",""),a=e.control(b),a.params.theme):!1},updateLimits:function(){this.getNextTheme()||this.overlay.find(".right").addClass("disabled"),this.getPreviousTheme()||this.overlay.find(".left").addClass("disabled")},showDetails:function(a,c){var d=this;c=c||function(){},d.currentTheme=a.id,d.overlay.html(d.template(a)).fadeIn("fast").focus(),b("body").addClass("modal-open"),d.containFocus(d.overlay),d.updateLimits(),c()},closeDetails:function(){b("body").removeClass("modal-open"),this.overlay.fadeOut("fast"),e.control("theme_"+this.currentTheme).focus()},containFocus:function(a){var c;a.on("keydown",function(d){return 9===d.keyCode?(c=b(":tabbable",a),c.last()[0]!==d.target||d.shiftKey?c.first()[0]===d.target&&d.shiftKey?(c.last().focus(),!1):void 0:(c.first().focus(),!1)):void 0})}}),e.Panel=c.extend({initialize:function(a,b){var d=this;c.prototype.initialize.call(d,a,b),d.embed(),d.deferred.embedded.done(function(){d.ready()})},embed:function(){var a=this,c=b("#customize-theme-controls > ul");a.container.parent().is(c)||c.append(a.container),a.deferred.embedded.resolve()},attachEvents:function(){var a,b=this;b.container.find(".accordion-section-title").on("click 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c,d,f=this,g=f.container.closest(".accordion-section"),h=g.closest(".wp-full-overlay"),i=g.closest(".wp-full-overlay-sidebar-content"),j=i.find(".open"),k=h.find("#customize-theme-controls > ul > .accordion-section > .accordion-section-title").add("#customize-info > 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d,f,g,h=this;h.params={},b.extend(h,c||{}),h.id=a,h.selector="#customize-control-"+a.replace(/\]/g,"").replace(/\[/g,"-"),h.templateSelector="customize-control-"+h.params.type+"-content",h.container=b(h.params.content?h.params.content:h.selector),h.deferred={embedded:new b.Deferred},h.section=new e.Value,h.priority=new e.Value,h.active=new e.Value,h.activeArgumentsQueue=[],h.elements=[],d=h.container.find("[data-customize-setting-link]"),f={},d.each(function(){var a,c=b(this);if(c.is(":radio")){if(a=c.prop("name"),f[a])return;f[a]=!0,c=d.filter('[name="'+a+'"]')}e(c.data("customizeSettingLink"),function(a){var b=new e.Element(c);h.elements.push(b),b.sync(a),b.set(a())})}),h.active.bind(function(a){var c=h.activeArgumentsQueue.shift();c=b.extend({},h.defaultActiveArguments,c),h.onChangeActive(a,c)}),h.section.set(h.params.section),h.priority.set(isNaN(h.params.priority)?10:h.params.priority),h.active.set(h.params.active),e.utils.bubbleChildValueChanges(h,["section","priority","active"]),g=b.map(h.params.settings,function(a){return a}),e.apply(e,g.concat(function(){var a;h.settings={};for(a in h.params.settings)h.settings[a]=e(h.params.settings[a]);h.setting=h.settings["default"]||null,h.embed()})),h.deferred.embedded.done(function(){h.ready()})},embed:function(){var a,b=this;a=function(a){var c;a&&e.section(a,function(a){a.deferred.embedded.done(function(){c=a.container.find("ul:first"),b.container.parent().is(c)||(c.append(b.container),b.renderContent()),b.deferred.embedded.resolve()})})},b.section.bind(a),a(b.section.get())},ready:function(){},expand:function(a){e.section(this.section()).expand(a)},focus:d,onChangeActive:function(a,c){b.contains(document,this.container)?a?this.container.slideDown(c.duration,c.completeCallback):this.container.slideUp(c.duration,c.completeCallback):(this.container.toggle(a),c.completeCallback&&c.completeCallback())},toggle:function(a){return this.onChangeActive(a,this.defaultActiveArguments)},activate:c.prototype.activate,deactivate:c.prototype.deactivate,_toggleActive:c.prototype._toggleActive,dropdownInit:function(){var a=this,b=this.container.find(".dropdown-status"),c=this.params,d=!1,f=function(a){"string"==typeof a&&c.statuses&&c.statuses[a]?b.html(c.statuses[a]).show():b.hide()};this.container.on("click 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a,b=this.frame.state().get("selection").first().toJSON(),c=window._wpmejsSettings||{};this.params.attachment=b,this.setting(b.url),a=this.container.find("audio, video").get(0),a?this.player=new MediaElementPlayer(a,c):this.cleanupPlayer()},success:function(){},removerVisibility:function(){}}),e.ImageControl=e.UploadControl.extend({thumbnailSrc:function(){}}),e.BackgroundControl=e.UploadControl.extend({ready:function(){e.UploadControl.prototype.ready.apply(this,arguments)},select:function(){e.UploadControl.prototype.select.apply(this,arguments),wp.ajax.post("custom-background-add",{nonce:_wpCustomizeBackground.nonces.add,wp_customize:"on",theme:e.settings.theme.stylesheet,attachment_id:this.params.attachment.id})}}),e.HeaderControl=e.Control.extend({ready:function(){this.btnRemove=b("#customize-control-header_image .actions .remove"),this.btnNew=b("#customize-control-header_image .actions 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c,d,f,g,h,i,j=parseInt(_wpCustomizeHeader.data.width,10),k=parseInt(_wpCustomizeHeader.data.height,10),l=!!parseInt(_wpCustomizeHeader.data["flex-width"],10),m=!!parseInt(_wpCustomizeHeader.data["flex-height"],10);return h=a.get("width"),g=a.get("height"),this.headerImage=new e.HeaderTool.ImageModel,this.headerImage.set({themeWidth:j,themeHeight:k,themeFlexWidth:l,themeFlexHeight:m,imageWidth:h,imageHeight:g}),b.set("canSkipCrop",!this.headerImage.shouldBeCropped()),c=j/k,d=h,f=g,d/f>c?(k=f,j=k*c):(j=d,k=j/c),i={handles:!0,keys:!0,instance:!0,persistent:!0,imageWidth:h,imageHeight:g,x1:0,y1:0,x2:j,y2:k},m===!1&&l===!1&&(i.aspectRatio=j+":"+k),m===!1&&(i.maxHeight=k),l===!1&&(i.maxWidth=j),i},openMedia:function(a){var b=_wpMediaViewsL10n;a.preventDefault(),this.frame=wp.media({button:{text:b.selectAndCrop,close:!1},states:[new 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e.HeaderTool.ImageModel({header:g,choice:a.split("/").pop()}),e.HeaderTool.UploadsList.add(f),e.HeaderTool.currentHeader.set(f.toJSON()),f.save(),f.importImage()},removeImage:function(){e.HeaderTool.currentHeader.trigger("hide"),e.HeaderTool.CombinedList.trigger("control:removeImage")}}),e.ThemeControl=e.Control.extend({touchDrag:!1,ready:function(){var a=this;a.container.on("touchmove",".theme",function(){a.touchDrag=!0}),a.container.on("click keydown touchend",".theme",function(c){return e.utils.isKeydownButNotEnterEvent(c)?void 0:a.touchDrag===!0?a.touchDrag=!1:void(b(c.target).is(".theme-actions .button")||e.section(a.section()).showDetails(a.params.theme))}),a.container.on("click keydown",".theme-actions .button",function(a){e.utils.isKeydownButNotEnterEvent(a)||b(".wp-full-overlay").addClass("customize-loading")})},filter:function(a){var b=this,c=b.params.theme.name+" "+b.params.theme.description+" "+b.params.theme.tags+" "+b.params.theme.author;c=c.toLowerCase().replace("-"," 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a,c,f=this,g=e.state("processing");d.addClass("saving"),c=function(){var a,c;c=b.extend(f.query(),{nonce:f.nonce.save}),a=wp.ajax.post("customize_save",c),e.trigger("save",a),a.always(function(){d.removeClass("saving")}),a.fail(function(a){"0"===a?a="not_logged_in":"-1"===a&&(a="invalid_nonce"),"invalid_nonce"===a?f.cheatin():"not_logged_in"===a&&(f.preview.iframe.hide(),f.login().done(function(){f.save(),f.preview.iframe.show()})),e.trigger("error",a)}),a.done(function(a){e.each(function(a){a._dirty=!1}),e.trigger("saved",a)})},0===g()?c():(a=function(){0===g()&&(e.state.unbind("change",a),c())},e.state.bind("change",a))}}),e.previewer.bind("nonce",function(a){b.extend(this.nonce,a)}),b.each(e.settings.settings,function(a,b){e.create(a,a,b.value,{transport:b.transport,previewer:e.previewer,dirty:!!b.dirty})}),b.each(e.settings.panels,function(a,b){var c,d=e.panelConstructor[b.type]||e.Panel;c=new d(a,{params:b}),e.panel.add(a,c)}),b.each(e.settings.sections,function(a,b){var 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keydown",".upload-button",a.pausePlayer),a.container.on("click keydown",".thumbnail-image img",a.openFrame),a.container.on("click keydown",".default-button",a.restoreDefault),a.container.on("click keydown",".remove-button",a.pausePlayer),a.container.on("click keydown",".remove-button",a.removeFile),a.container.on("click keydown",".remove-button",a.cleanupPlayer),e.section(a.section()).container.on("expanded",function(){a.player&&a.player.setControlsSize()}).on("collapsed",function(){a.pausePlayer()}),a.setting.bind(function(){a.renderContent()})},pausePlayer:function(){this.player&&this.player.pause()},cleanupPlayer:function(){this.player&&wp.media.mixin.removePlayer(this.player)},openFrame:function(a){e.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),this.frame||this.initFrame(),this.frame.open())},initFrame:function(){this.frame=wp.media({button:{text:this.params.button_labels.frame_button},states:[new wp.media.controller.Library({title:this.params.button_labels.frame_title,library:wp.media.query({type:this.params.mime_type}),multiple:!1,date:!1})]}),this.frame.on("select",this.select)},select:function(){var a,b=this.frame.state().get("selection").first().toJSON(),c=window._wpmejsSettings||{};this.params.attachment=b,this.setting(b.id),a=this.container.find("audio, video").get(0),a?this.player=new MediaElementPlayer(a,c):this.cleanupPlayer()},restoreDefault:function(a){e.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),this.params.attachment=this.params.defaultAttachment,this.setting(this.params.defaultAttachment.url))},removeFile:function(a){e.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),this.params.attachment={},this.setting(""),this.renderContent())}}),e.UploadControl=e.MediaControl.extend({select:function(){var a,b=this.frame.state().get("selection").first().toJSON(),c=window._wpmejsSettings||{};this.params.attachment=b,this.setting(b.url),a=this.container.find("audio, video").get(0),a?this.player=new MediaElementPlayer(a,c):this.cleanupPlayer()},success:function(){},removerVisibility:function(){}}),e.ImageControl=e.UploadControl.extend({thumbnailSrc:function(){}}),e.BackgroundControl=e.UploadControl.extend({ready:function(){e.UploadControl.prototype.ready.apply(this,arguments)},select:function(){e.UploadControl.prototype.select.apply(this,arguments),wp.ajax.post("custom-background-add",{nonce:_wpCustomizeBackground.nonces.add,wp_customize:"on",theme:e.settings.theme.stylesheet,attachment_id:this.params.attachment.id})}}),e.HeaderControl=e.Control.extend({ready:function(){this.btnRemove=b("#customize-control-header_image .actions .remove"),this.btnNew=b("#customize-control-header_image .actions .new"),_.bindAll(this,"openMedia","removeImage"),this.btnNew.on("click",this.openMedia),this.btnRemove.on("click",this.removeImage),e.HeaderTool.currentHeader=new e.HeaderTool.ImageModel,new e.HeaderTool.CurrentView({model:e.HeaderTool.currentHeader,el:"#customize-control-header_image .current .container"}),new e.HeaderTool.ChoiceListView({collection:e.HeaderTool.UploadsList=new e.HeaderTool.ChoiceList,el:"#customize-control-header_image .choices .uploaded .list"}),new e.HeaderTool.ChoiceListView({collection:e.HeaderTool.DefaultsList=new e.HeaderTool.DefaultsList,el:"#customize-control-header_image .choices .default .list"}),e.HeaderTool.combinedList=e.HeaderTool.CombinedList=new e.HeaderTool.CombinedList([e.HeaderTool.UploadsList,e.HeaderTool.DefaultsList])},calculateImageSelectOptions:function(a,b){var c,d,f,g,h,i,j=parseInt(_wpCustomizeHeader.data.width,10),k=parseInt(_wpCustomizeHeader.data.height,10),l=!!parseInt(_wpCustomizeHeader.data["flex-width"],10),m=!!parseInt(_wpCustomizeHeader.data["flex-height"],10);return h=a.get("width"),g=a.get("height"),this.headerImage=new e.HeaderTool.ImageModel,this.headerImage.set({themeWidth:j,themeHeight:k,themeFlexWidth:l,themeFlexHeight:m,imageWidth:h,imageHeight:g}),b.set("canSkipCrop",!this.headerImage.shouldBeCropped()),c=j/k,d=h,f=g,d/f>c?(k=f,j=k*c):(j=d,k=j/c),i={handles:!0,keys:!0,instance:!0,persistent:!0,imageWidth:h,imageHeight:g,x1:0,y1:0,x2:j,y2:k},m===!1&&l===!1&&(i.aspectRatio=j+":"+k),m===!1&&(i.maxHeight=k),l===!1&&(i.maxWidth=j),i},openMedia:function(a){var b=_wpMediaViewsL10n;a.preventDefault(),this.frame=wp.media({button:{text:b.selectAndCrop,close:!1},states:[new wp.media.controller.Library({title:b.chooseImage,library:wp.media.query({type:"image"}),multiple:!1,date:!1,priority:20,suggestedWidth:_wpCustomizeHeader.data.width,suggestedHeight:_wpCustomizeHeader.data.height}),new wp.media.controller.Cropper({imgSelectOptions:this.calculateImageSelectOptions})]}),this.frame.on("select",this.onSelect,this),this.frame.on("cropped",this.onCropped,this),this.frame.on("skippedcrop",this.onSkippedCrop,this),this.frame.open()},onSelect:function(){this.frame.setState("cropper")},onCropped:function(a){var b=a.post_content,c=a.attachment_id,d=a.width,e=a.height;this.setImageFromURL(b,c,d,e)},onSkippedCrop:function(a){var b=a.get("url"),c=a.get("width"),d=a.get("height");this.setImageFromURL(b,a.id,c,d)},setImageFromURL:function(a,b,c,d){var f,g={};g.url=a,g.thumbnail_url=a,g.timestamp=_.now(),b&&(g.attachment_id=b),c&&(g.width=c),d&&(g.height=d),f=new e.HeaderTool.ImageModel({header:g,choice:a.split("/").pop()}),e.HeaderTool.UploadsList.add(f),e.HeaderTool.currentHeader.set(f.toJSON()),f.save(),f.importImage()},removeImage:function(){e.HeaderTool.currentHeader.trigger("hide"),e.HeaderTool.CombinedList.trigger("control:removeImage")}}),e.ThemeControl=e.Control.extend({touchDrag:!1,ready:function(){var a=this;a.container.on("touchmove",".theme",function(){a.touchDrag=!0}),a.container.on("click keydown touchend",".theme",function(c){return e.utils.isKeydownButNotEnterEvent(c)?void 0:a.touchDrag===!0?a.touchDrag=!1:void(b(c.target).is(".theme-actions .button")||e.section(a.section()).showDetails(a.params.theme))}),a.container.on("click keydown",".theme-actions .button",function(a){e.utils.isKeydownButNotEnterEvent(a)||b(".wp-full-overlay").addClass("customize-loading")})},filter:function(a){var b=this,c=b.params.theme.name+" "+b.params.theme.description+" "+b.params.theme.tags+" "+b.params.theme.author;c=c.toLowerCase().replace("-"," "),-1!==c.search(a)?b.activate():b.deactivate()}}),e.defaultConstructor=e.Setting,e.control=new e.Values({defaultConstructor:e.Control}),e.section=new e.Values({defaultConstructor:e.Section}),e.panel=new e.Values({defaultConstructor:e.Panel}),e.PreviewFrame=e.Messenger.extend({sensitivity:2e3,initialize:function(a,c){var d=b.Deferred();d.promise(this),this.container=a.container,this.signature=a.signature,b.extend(a,{channel:e.PreviewFrame.uuid()}),e.Messenger.prototype.initialize.call(this,a,c),this.add("previewUrl",a.previewUrl),this.query=b.extend(a.query||{},{customize_messenger_channel:this.channel()}),this.run(d)},run:function(a){var c=this,d=!1,f=!1;this._ready&&this.unbind("ready",this._ready),this._ready=function(){f=!0,d&&a.resolveWith(c)},this.bind("ready",this._ready),this.bind("ready",function(a){if(this.container.addClass("iframe-ready"),a){var b={panel:a.activePanels,section:a.activeSections,control:a.activeControls};_(b).each(function(a,b){e[b].each(function(b,c){var d=!(!a||!a[c]);b.active(d)})})}}),this.request=b.ajax(this.previewUrl(),{type:"POST",data:this.query,xhrFields:{withCredentials:!0}}),this.request.fail(function(){a.rejectWith(c,["request failure"])}),this.request.done(function(g){var h,i=c.request.getResponseHeader("Location"),j=c.signature;return i&&i!==c.previewUrl()?void a.rejectWith(c,["redirect",i]):"0"===g?void c.login(a):"-1"===g?void a.rejectWith(c,["cheatin"]):(h=g.lastIndexOf(j),-1===h||h<g.lastIndexOf("</html>")?void a.rejectWith(c,["unsigned"]):(g=g.slice(0,h)+g.slice(h+j.length),c.iframe=b("<iframe />",{title:e.l10n.previewIframeTitle}).appendTo(c.container),c.iframe.one("load",function(){d=!0,f?a.resolveWith(c):setTimeout(function(){a.rejectWith(c,["ready timeout"])},c.sensitivity)}),c.targetWindow(c.iframe[0].contentWindow),c.targetWindow().document.open(),c.targetWindow().document.write(g),void c.targetWindow().document.close()))})},login:function(a){var c,d=this;return c=function(){a.rejectWith(d,["logged out"])},this.triedLogin?c():void b.get(e.settings.url.ajax,{action:"logged-in"}).fail(c).done(function(f){var g;"1"!==f&&c(),g=b("<iframe />",{src:d.previewUrl(),title:e.l10n.previewIframeTitle}).hide(),g.appendTo(d.container),g.load(function(){d.triedLogin=!0,g.remove(),d.run(a)})})},destroy:function(){e.Messenger.prototype.destroy.call(this),this.request.abort(),this.iframe&&this.iframe.remove(),delete this.request,delete this.iframe,delete this.targetWindow}}),function(){var a=0;e.PreviewFrame.uuid=function(){return"preview-"+a++}}(),e.setDocumentTitle=function(a){var b,c;b=e.settings.documentTitleTmpl,c=b.replace("%s",a),document.title=c,e.trigger("title",c)},e.Previewer=e.Messenger.extend({refreshBuffer:250,initialize:function(a,c){var d=this,f=/^https?/;b.extend(this,c||{}),this.deferred={active:b.Deferred()},this.refresh=function(a){var b,c=a.refresh,d=function(){b=null,c.call(a)};return function(){if("number"!=typeof b){if(!a.loading)return d();a.abort()}clearTimeout(b),b=setTimeout(d,a.refreshBuffer)}}(this),this.container=e.ensure(a.container),this.allowedUrls=a.allowedUrls,this.signature=a.signature,a.url=window.location.href,e.Messenger.prototype.initialize.call(this,a),this.add("scheme",this.origin()).link(this.origin).setter(function(a){var b=a.match(f);return b?b[0]:""}),this.add("previewUrl",a.previewUrl).setter(function(a){var c;return/\/wp-admin(\/|$)/.test(a.replace(/[#?].*$/,""))?null:(b.each([a.replace(f,d.scheme()),a],function(a,e){return b.each(d.allowedUrls,function(a,b){var d;return b=b.replace(/\/+$/,""),d=e.replace(b,""),0===e.indexOf(b)&&/^([/#?]|$)/.test(d)?(c=e,!1):void 0}),c?!1:void 0}),c?c:null)}),this.previewUrl.bind(this.refresh),this.scroll=0,this.bind("scroll",function(a){this.scroll=a}),this.bind("url",this.previewUrl),this.bind("documentTitle",function(a){e.setDocumentTitle(a)})},query:function(){},abort:function(){this.loading&&(this.loading.destroy(),delete this.loading)},refresh:function(){var a=this;this.send("loading-initiated"),this.abort(),this.loading=new e.PreviewFrame({url:this.url(),previewUrl:this.previewUrl(),query:this.query()||{},container:this.container,signature:this.signature}),this.loading.done(function(){this.bind("synced",function(){a.preview&&a.preview.destroy(),a.preview=this,delete a.loading,a.targetWindow(this.targetWindow()),a.channel(this.channel()),a.deferred.active.resolve(),a.send("active")}),this.send("sync",{scroll:a.scroll,settings:e.get()})}),this.loading.fail(function(b,c){a.send("loading-failed"),"redirect"===b&&c&&a.previewUrl(c),"logged out"===b&&(a.preview&&(a.preview.destroy(),delete a.preview),a.login().done(a.refresh)),"cheatin"===b&&a.cheatin()})},login:function(){var a,c,d,f=this;return this._login?this._login:(a=b.Deferred(),this._login=a.promise(),c=new e.Messenger({channel:"login",url:e.settings.url.login}),d=b("<iframe />",{src:e.settings.url.login,title:e.l10n.loginIframeTitle}).appendTo(this.container),c.targetWindow(d[0].contentWindow),c.bind("login",function(){d.remove(),c.destroy(),delete f._login,a.resolve()}),this._login)},cheatin:function(){b(document.body).empty().addClass("cheatin").append("<p>"+e.l10n.cheatin+"</p>")}}),e.controlConstructor={color:e.ColorControl,media:e.MediaControl,upload:e.UploadControl,image:e.ImageControl,header:e.HeaderControl,background:e.BackgroundControl,theme:e.ThemeControl},e.panelConstructor={},e.sectionConstructor={themes:e.ThemesSection},b(function(){if(e.settings=window._wpCustomizeSettings,e.l10n=window._wpCustomizeControlsL10n,e.settings){if(!b.support.postMessage||!b.support.cors&&e.settings.isCrossDomain)return window.location=e.settings.url.fallback;var a,c,d=b(document.body),f=d.children(".wp-full-overlay"),g=b("#customize-info .theme-name.site-title"),h=b(".customize-controls-close"),i=b("#save");b("#customize-controls").on("keydown",function(a){var c=13===a.which,d=b(a.target);c&&(d.is("input:not([type=button])")||d.is("select"))&&a.preventDefault()}),b("#customize-info").find("> .accordion-section-title").on("click keydown",function(a){if(!e.utils.isKeydownButNotEnterEvent(a)){a.preventDefault();var c=b(this).parent(),d=c.find(".accordion-section-content:first");c.hasClass("cannot-expand")||(c.hasClass("open")?(c.toggleClass("open"),d.slideUp(e.Panel.prototype.defaultExpandedArguments.duration)):(d.slideDown(e.Panel.prototype.defaultExpandedArguments.duration),c.toggleClass("open")))}}),e.previewer=new e.Previewer({container:"#customize-preview",form:"#customize-controls",previewUrl:e.settings.url.preview,allowedUrls:e.settings.url.allowed,signature:"WP_CUSTOMIZER_SIGNATURE"},{nonce:e.settings.nonce,query:function(){var a={};return e.each(function(b,c){b._dirty&&(a[c]=b())}),{wp_customize:"on",theme:e.settings.theme.stylesheet,customized:JSON.stringify(a),nonce:this.nonce.preview}},save:function(){var a,c,f=this,g=e.state("processing");d.addClass("saving"),c=function(){var a,c;c=b.extend(f.query(),{nonce:f.nonce.save}),a=wp.ajax.post("customize_save",c),e.trigger("save",a),a.always(function(){d.removeClass("saving")}),a.fail(function(a){"0"===a?a="not_logged_in":"-1"===a&&(a="invalid_nonce"),"invalid_nonce"===a?f.cheatin():"not_logged_in"===a&&(f.preview.iframe.hide(),f.login().done(function(){f.save(),f.preview.iframe.show()})),e.trigger("error",a)}),a.done(function(a){e.each(function(a){a._dirty=!1}),e.trigger("saved",a)})},0===g()?c():(a=function(){0===g()&&(e.state.unbind("change",a),c())},e.state.bind("change",a))}}),e.previewer.bind("nonce",function(a){b.extend(this.nonce,a)}),b.each(e.settings.settings,function(a,b){e.create(a,a,b.value,{transport:b.transport,previewer:e.previewer,dirty:!!b.dirty})}),b.each(e.settings.panels,function(a,b){var c,d=e.panelConstructor[b.type]||e.Panel;c=new d(a,{params:b}),e.panel.add(a,c)}),b.each(e.settings.sections,function(a,b){var c,d=e.sectionConstructor[b.type]||e.Section;c=new d(a,{params:b}),e.section.add(a,c)}),b.each(e.settings.controls,function(a,b){var c,d=e.controlConstructor[b.type]||e.Control;c=new d(a,{params:b,previewer:e.previewer}),e.control.add(a,c)}),_.each(["panel","section","control"],function(a){var b,c=e.settings.autofocus[a];c&&e[a](c)&&(b=e[a](c),b.deferred.embedded.done(function(){e.previewer.deferred.active.done(function(){b.focus()})}))}),e.reflowPaneContents=_.bind(function(){var a,c,d,f=[],g=!1;document.activeElement&&(c=b(document.activeElement)),e.panel.each(function(b){var c=b.sections(),d=_.pluck(c,"container");f.push(b),a=b.container.find("ul:first"),e.utils.areElementListsEqual(d,a.children("[id]"))||(_(c).each(function(b){a.append(b.container)}),g=!0)}),e.section.each(function(b){var c=b.controls(),d=_.pluck(c,"container");b.panel()||f.push(b),a=b.container.find("ul:first"),e.utils.areElementListsEqual(d,a.children("[id]"))||(_(c).each(function(b){a.append(b.container)}),g=!0)}),f.sort(e.utils.prioritySort),d=_.pluck(f,"container"),a=b("#customize-theme-controls").children("ul"),e.utils.areElementListsEqual(d,a.children())||(_(f).each(function(b){a.append(b.container)}),g=!0),e.panel.each(function(a){var b=a.active();a.active.callbacks.fireWith(a.active,[b,b])}),e.section.each(function(a){var b=a.active();a.active.callbacks.fireWith(a.active,[b,b])}),g&&c&&c.focus()},e),e.bind("ready",e.reflowPaneContents),e.reflowPaneContents=_.debounce(e.reflowPaneContents,100),b([e.panel,e.section,e.control]).each(function(a,b){b.bind("add",e.reflowPaneContents),b.bind("change",e.reflowPaneContents),b.bind("remove",e.reflowPaneContents)}),e.previewer.previewUrl()?e.previewer.refresh():e.previewer.previewUrl(e.settings.url.home),function(){var a=new e.Values,b=a.create("saved"),c=a.create("activated"),d=a.create("processing");a.bind("change",function(){c()?b()?(i.val(e.l10n.saved).prop("disabled",!0),h.find(".screen-reader-text").text(e.l10n.close)):(i.val(e.l10n.save).prop("disabled",!1),h.find(".screen-reader-text").text(e.l10n.cancel)):(i.val(e.l10n.activate).prop("disabled",!1),h.find(".screen-reader-text").text(e.l10n.cancel))}),b(!0),c(e.settings.theme.active),d(0),e.bind("change",function(){a("saved").set(!1)}),e.bind("saved",function(){a("saved").set(!0),a("activated").set(!0)}),c.bind(function(a){a&&e.trigger("activated")}),e.state=a}(),i.click(function(a){e.previewer.save(),a.preventDefault()}).keydown(function(a){9!==a.which&&(13===a.which&&e.previewer.save(),a.preventDefault())}),b("#customize-header-actions").on("click keydown",".control-panel-back",function(a){e.utils.isKeydownButNotEnterEvent(a)||(a.preventDefault(),e.panel.each(function(a){a.collapse()}))}),h.keydown(function(a){9!==a.which&&(13===a.which&&this.click(),a.preventDefault())}),b(".collapse-sidebar").on("click keydown",function(a){e.utils.isKeydownButNotEnterEvent(a)||(f.toggleClass("collapsed").toggleClass("expanded"),a.preventDefault())
 }),b(".customize-controls-preview-toggle").on("click keydown",function(a){e.utils.isKeydownButNotEnterEvent(a)||(f.toggleClass("preview-only"),a.preventDefault())}),g.length&&b("#customize-control-blogname input").on("input",function(){g.text(this.value)}),a=new e.Messenger({url:e.settings.url.parent,channel:"loader"}),a.bind("back",function(){h.on("click.customize-controls-close",function(b){b.preventDefault(),a.send("close")})}),b(window).on("beforeunload",function(){return e.state("saved")()?void 0:(setTimeout(function(){f.removeClass("customize-loading")},1),e.l10n.saveAlert)}),b.each(["saved","change"],function(b,c){e.bind(c,function(){a.send(c)})}),e.bind("activated",function(){a.targetWindow()?a.send("activated",e.settings.url.activated):e.settings.url.activated&&(window.location=e.settings.url.activated)}),e.bind("title",function(b){a.send("title",b)}),a.send("ready"),b.each({background_image:{controls:["background_repeat","background_position_x","background_attachment"],callback:function(a){return!!a}},show_on_front:{controls:["page_on_front","page_for_posts"],callback:function(a){return"page"===a}},header_textcolor:{controls:["header_textcolor"],callback:function(a){return"blank"!==a}}},function(a,c){e(a,function(a){b.each(c.controls,function(b,d){e.control(d,function(b){var d=function(a){b.container.toggle(c.callback(a))};d(a.get()),a.bind(d)})})})}),e.control("display_header_text",function(a){var b="";a.elements[0].unsync(e("header_textcolor")),a.element=new e.Element(a.container.find("input")),a.element.set("blank"!==a.setting()),a.element.bind(function(c){c||(b=e("header_textcolor").get()),a.setting.set(c?b:"blank")}),a.setting.bind(function(b){a.element.set("blank"!==b)})}),e.trigger("ready"),c=h,c.focus(),setTimeout(function(){c.focus()},200)}})}(wp,jQuery);
\ No newline at end of file
diff --git a/wp-includes/class-wp-customize-section.php b/wp-includes/class-wp-customize-section.php
index c2afac6d1e..779f9c6621 100644
--- a/wp-includes/class-wp-customize-section.php
+++ b/wp-includes/class-wp-customize-section.php
@@ -345,7 +345,6 @@ class WP_Customize_Themes_Section extends WP_Customize_Section {
 				<?php echo esc_html( $this->title ); ?>
 				<span class="screen-reader-text"><?php _e( 'Press return or enter to expand' ); ?></span>
 			</h3>
-			<span class="control-panel-back themes-panel-back" tabindex="-1"><span class="screen-reader-text"><?php _e( 'Back' ); ?></span></span>
 			<div class="customize-themes-panel control-panel-content themes-php">
 				<h2><?php esc_html_e( 'Themes' ); ?>
 					<span class="title-count theme-count"><?php echo count( $this->controls ) - 1; ?></span>
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d5309b6be2..d3d2789571 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-beta3-31917';
+$wp_version = '4.2-beta3-31918';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.