Ticket #33417: 33417.patch

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

@@ -2144 +2144 @@
                  * @param {object} attachment
                  */
                 setImageFromAttachment: function( attachment ) {
-                        var icon = typeof attachment.sizes['site_icon-32'] !== 'undefined' ? attachment.sizes['site_icon-32'] : attachment.sizes.thumbnail;
+                        var sizes = [ 'site_icon-32', 'thumbnail', 'full' ],
+                                icon;
 
+                        _.each( sizes, function( size ) {
+                                if ( ! icon && ! _.isUndefined ( attachment.sizes[ size ] ) ) {
+                                        icon = attachment.sizes[ size ];
+                                }
+                        } );
+
                         this.params.attachment = attachment;
 
                         // Set the Customizer setting; the callback takes care of rendering.
                         this.setting( attachment.id );
 
-
                         // Update the icon in-browser.
                         $( 'link[sizes="32x32"]' ).attr( 'href', icon.url );
                 },