Customizer: Better experience for widget filtering in desktop and iOS Safari.

Previously, the search field did not appear at all in desktop Safari, and the auto-focus keyboard fly-up in iOS rendered widget adding frustrating at best.

props dsmart, ocean90.
fixes #31987.


git-svn-id: https://develop.svn.wordpress.org/trunk@32243 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -342,7 +342,7 @@ body.adding-widget .add-new-widget:before {
 #available-widgets {
 	position: absolute;
 	overflow: auto;
-	top: 46px;
+	top: 0;
 	bottom: 0;
 	left: -301px;
 	width: 300px;
@@ -354,6 +354,14 @@ body.adding-widget .add-new-widget:before {
 	border-right: 1px solid #dddddd;
 }
 
+#available-widgets-list {
+	top: 46px;
+	position: absolute;
+	overflow: auto;
+	bottom: 0;
+	width: 100%;
+}
+
 #available-widgets-filter {
 	position: fixed;
 	top: 0;
@@ -614,6 +622,7 @@ body.adding-widget #customize-preview {
 
 @media screen and ( max-width: 640px ) {
 	body.adding-widget div#available-widgets {
+		top: 46px;
 		left: 0;
 		z-index: 10;
 		width: 100%;

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

@@ -294,7 +294,9 @@
 			// Reset search
 			this.collection.doSearch( '' );
 
-			this.$search.focus();
+			if ( ! api.settings.browser.mobile ) {
+				this.$search.focus();
+			}
 		},
 
 		// Closes the panel