diff --git a/wp-admin/js/customize-controls.js b/wp-admin/js/customize-controls.js
index 0570d2c385..aeee50f227 100644
--- a/wp-admin/js/customize-controls.js
+++ b/wp-admin/js/customize-controls.js
@@ -1692,7 +1692,7 @@
 			this.btnNew.on( 'click', this.openMedia );
 			this.btnRemove.on( 'click', this.removeImage );
 
-			api.HeaderTool.currentHeader = new api.HeaderTool.ImageModel();
+			api.HeaderTool.currentHeader = this.getInitialHeaderImage();
 
 			new api.HeaderTool.CurrentView({
 				model: api.HeaderTool.currentHeader,
@@ -1715,6 +1715,38 @@
 			]);
 		},
 
+		/**
+		 * Returns a new instance of api.HeaderTool.ImageModel based on the currently
+		 * saved header image (if any).
+		 *
+		 * @since 4.2.0
+		 *
+		 * @returns {Object} Options
+		 */
+		getInitialHeaderImage: function() {
+			if ( ! api.get().header_image || ! api.get().header_image_data || _.contains( [ 'remove-header', 'random-default-image', 'random-uploaded-image' ], api.get().header_image ) ) {
+				return new api.HeaderTool.ImageModel();
+			}
+
+			// Get the matching uploaded image object.
+			var currentHeaderObject = _.find( _wpCustomizeHeader.uploads, function( imageObj ) {
+				return ( imageObj.attachment_id === api.get().header_image_data.attachment_id );
+			} );
+			// Fall back to raw current header image.
+			if ( ! currentHeaderObject ) {
+				currentHeaderObject = {
+					url: api.get().header_image,
+					thumbnail_url: api.get().header_image,
+					attachment_id: api.get().header_image_data.attachment_id
+				};
+			}
+
+			return new api.HeaderTool.ImageModel({
+				header: currentHeaderObject,
+				choice: currentHeaderObject.url.split( '/' ).pop()
+			});
+		},
+
 		/**
 		 * Returns a set of options, computed from the attached image data and
 		 * theme-specific data, to be fed to the imgAreaSelect plugin in
diff --git a/wp-admin/js/customize-controls.min.js b/wp-admin/js/customize-controls.min.js
index 5dd8d7edfc..9d5df8f1e9 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(){var a;a=b.extended(e.Panel)&&b.expanded()?b.container.find(".control-panel-content:first"):b.container,a.find(":focusable:first").focus(),a[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:"",screenshotQueue:null,$window:b(window),$customizeSidebar:b(".wp-full-overlay-sidebar-content:first"),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())}),_.bindAll(this,"renderScreenshots")},isContextuallyActive:function(){return this.active()},attachEvents:function(){var a=this;a.container.find(".change-theme, .customize-theme").on("click keydown",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.expanded()?a.collapse():a.expand())}),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())});var b=_.throttle(_.bind(a.renderScreenshots,this),100);a.container.on("input","#themes-filter",function(c){var d,e=c.currentTarget.value.toLowerCase().trim().replace("-"," "),f=a.controls();_.each(f,function(a){a.filter(e)}),b(),d=a.container.find("li.customize-control:visible").length,a.container.find(".theme-count").text(d)}),e.bind("ready",function(){_.each(a.controls().slice(0,3),function(a){var b,c=a.params.theme.screenshot[0];c&&(b=new Image,b.src=c)})})},onChangeExpanded:function(a,c){if(c.unchanged)return void(c.completeCallback&&c.completeCallback());var d,f,g=this,h=g.container.closest(".accordion-section"),i=h.closest(".wp-full-overlay"),j=h.closest(".wp-full-overlay-sidebar-content"),k=j.find(".open"),l=i.find("#customize-theme-controls > ul > .accordion-section > .accordion-section-title").add("#customize-info > 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_(b).each(function(a){a.active()&&a.isContextuallyActive()&&(c+=1)}),0!==c},onChangeExpanded:function(a,c){if(c.unchanged)return void(c.completeCallback&&c.completeCallback());var d,f,g=this,h=g.container.closest(".accordion-section"),i=h.closest(".wp-full-overlay"),j=h.closest(".wp-full-overlay-sidebar-content"),k=j.find(".open"),l=i.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 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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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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 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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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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:"",screenshotQueue:null,$window:b(window),$customizeSidebar:b(".wp-full-overlay-sidebar-content:first"),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())}),_.bindAll(this,"renderScreenshots")},isContextuallyActive:function(){return this.active()},attachEvents:function(){var a=this;a.container.find(".change-theme, .customize-theme").on("click keydown",function(b){e.utils.isKeydownButNotEnterEvent(b)||(b.preventDefault(),a.expanded()?a.collapse():a.expand())}),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())});var b=_.throttle(_.bind(a.renderScreenshots,this),100);a.container.on("input","#themes-filter",function(c){var d,e=c.currentTarget.value.toLowerCase().trim().replace("-"," 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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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a=_.find(_wpCustomizeHeader.uploads,function(a){return a.attachment_id===e.get().header_image_data.attachment_id});return a||(a={url:e.get().header_image,thumbnail_url:e.get().header_image,attachment_id:e.get().header_image_data.attachment_id}),new e.HeaderTool.ImageModel({header:a,choice:a.url.split("/").pop()})},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,renderContent:function(){var a=this,b=arguments;e.section(a.section(),function(c){c.expanded()?e.Control.prototype.renderContent.apply(a,b):c.expanded.bind(function(c){c&&e.Control.prototype.renderContent.apply(a,b)})})},ready:function(){var a=this;a.container.on("touchmove",".theme",function(){a.touchDrag=!0}),a.container.on("click keydown touchend",".theme",function(c){if(!e.utils.isKeydownButNotEnterEvent(c)){if(a.touchDrag===!0)return a.touchDrag=!1;if(!b(c.target).is(".theme-actions .button")){var d=b(this).data("previewUrl");b(".wp-full-overlay").addClass("customize-loading"),window.parent.location=d}}}),a.container.on("click keydown",".theme-actions 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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 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c.promise(),a=wp.ajax.post("customize_refresh_nonces",{wp_customize:"on",theme:e.settings.theme.stylesheet}),a.done(function(a){e.trigger("nonce-refresh",a),c.resolve()}),a.fail(function(){c.reject()}),c}}),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 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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)}),e.bind("nonce-refresh",function(a){b.extend(e.settings.nonce,a),b.extend(e.previewer.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/version.php b/wp-includes/version.php
index a1033dbfce..3a49e92a25 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-beta4-32090';
+$wp_version = '4.2-beta4-32091';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.