Themes screens: Lose search input focus when pressing enter.

This allows the keyboard to close on iOS, for example.

props matveb.
fixes #27233.

Built from https://develop.svn.wordpress.org/trunk@27555


git-svn-id: http://core.svn.wordpress.org/trunk@27398 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/theme.js

@@ -803,6 +803,11 @@ themes.view.Search = wp.Backbone.View.extend({
 			event.target.value = '';
 		}
 
+		// Lose input focus when pressing enter
+		if ( event.which === 13 ) {
+			this.$el.trigger( 'blur' );
+		}
+
 		this.collection.doSearch( event.target.value );
 
 		// if search is initiated and key is not return