Ticket #38222: trac-38222_1.diff

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

@@ -1267 +1267 @@
 
                                 overlay.addClass( 'in-themes-panel' );
                                 section.addClass( 'current-panel' );
+                                _.delay( panel.renderScreenshots, 10 ); // Wait for the controls
+                                panel.$customizeSidebar.on( 'scroll.customize-themes-section', _.throttle( panel.renderScreenshots, 300 ) );
 
                         } else if ( ! expanded && section.hasClass( 'current-panel' ) ) {
                                 panel._animateChangeExpanded( function() {
@@ -1283 +1285 @@
 
                                 overlay.removeClass( 'in-themes-panel' );
                                 section.removeClass( 'current-panel' );
+                                panel.$customizeSidebar.off( 'scroll.customize-themes-section' );
                         }
                 },