Themes: Avoid announcing the theme search results too many times.

Props afercia.
Fixes #36848.
Built from https://develop.svn.wordpress.org/trunk@37967


git-svn-id: http://core.svn.wordpress.org/trunk@37908 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/theme.js

@@ -1103,7 +1103,13 @@ themes.view.Themes = wp.Backbone.View.extend({
 		this.liveThemeCount = this.collection.count ? this.collection.count : this.collection.length;
 		this.count.text( this.liveThemeCount );
 
-		this.announceSearchResults( this.liveThemeCount );
+		/*
+		 * In the theme installer the themes count is already announced
+		 * because `announceSearchResults` is called on `query:success`.
+		 */
+		if ( ! themes.isInstall ) {
+			this.announceSearchResults( this.liveThemeCount );
+		}
 	},
 
 	// Iterates through each instance of the collection
@@ -1459,6 +1465,8 @@ themes.view.InstallerSearch =  themes.view.Search.extend({
 		'keyup': 'search'
 	},
 
+	terms: '',
+
 	// Handles Ajax request for searching through themes in public repo
 	search: function( event ) {
 
@@ -1480,6 +1488,14 @@ themes.view.InstallerSearch =  themes.view.Search.extend({
 	doSearch: _.debounce( function( value ) {
 		var request = {};
 
+		// Don't do anything if the search terms haven't changed.
+		if ( this.terms === value ) {
+			return;
+		}
+
+		// Updates terms with the value passed.
+		this.terms = value;
+
 		request.search = value;
 
 		// Intercept an [author] search.

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta1-37966';
+$wp_version = '4.6-beta1-37967';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.