Ticket #42359: 42359.diff

src/wp-admin/css/customize-controls.css

@@ -2954 +2954 @@
         body.adding-widget div#available-widgets,
         body.adding-menu-items div#available-menu-items,
         body.outer-section-open div#customize-sidebar-outer-content {
-                top: 46px;
-                left: 0;
-                z-index: 10;
                 width: 100%;
         }
 
@@ -3040 +3037 @@
                 padding: 8px 15px;
                 box-shadow: none;
         }
+
+        .wp-full-overlay.expanded {
+                margin-left: 0;
+        }
+
+        body.adding-widget div#available-widgets,
+        body.adding-menu-items div#available-menu-items,
+        body.outer-section-open div#customize-sidebar-outer-content {
+                top: 46px;
+                left: 0;
+                z-index: 10;
+                width: 100%;
+        }
 }