Twenty Thirteen: disable fixed navbar on small screens. Props obenland, fixes #23647.

Also closes #23526, #23535, and #23566

git-svn-id: http://core.svn.wordpress.org/trunk@23533 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentythirteen/js/functions.js

@@ -29,7 +29,7 @@
 		if ( navbarOffset < 0 )
 			navbarOffset = navbar.offset().top - toolbarOffset;
 
-		if ( window.scrollY >= navbarOffset )
+		if ( window.scrollY >= navbarOffset && 644 < window.innerWidth )
 			html.addClass( 'navbar-fixed' );
 		else
 			html.removeClass( 'navbar-fixed' );

wp-content/themes/twentythirteen/style.css

@@ -2833,16 +2833,6 @@ footer.entry-meta {
 		font-size: 30px;
 	}
 
-	.navbar-fixed .site-title,
-	.site-description {
-		font-size: 18px;
-	}
-
-	.navbar-fixed .site-title {
-		line-height: 2.5;
-		max-width: 220px;
-	}
-
 	#content .entry-header,
 	#content .entry-content,
 	#content .entry-summary,
@@ -2899,11 +2889,6 @@ footer.entry-meta {
 		width: 100%;
 	}
 
-	.navbar-fixed .toggled-on .nav-menu,
-	.navbar-fixed .toggled-on .nav-menu > ul {
-		display: none;
-	}
-
 	.toggled-on li,
 	.toggled-on .children {
 		display: block;