Editor: restructure word count

* The WordCounter should only do one thing: count words. This makes it also easier to test.
* Add some really basic unit tests.
* Instead of only refreshing the count on enter and delete, refresh the count when the user stops typing. Also look at paste and content changes in TinyMCE.
* Use `match` instead of `replace` when it is appropriate.
* More readable code.

See #30966. Fixes #26620.


Built from https://develop.svn.wordpress.org/trunk@32856


git-svn-id: http://core.svn.wordpress.org/trunk@32827 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/tinymce/plugins/wordpress/plugin.js

@@ -7,8 +7,7 @@ tinymce.PluginManager.add( 'wordpress', function( editor ) {
 	var DOM = tinymce.DOM,
 		each = tinymce.each,
 		__ = editor.editorManager.i18n.translate,
-		wpAdvButton, style,
-		last = 0;
+		wpAdvButton, style;
 
 	if ( typeof window.jQuery !== 'undefined' ) {
 		window.jQuery( document ).triggerHandler( 'tinymce-editor-setup', [ editor ] );
@@ -363,23 +362,6 @@ tinymce.PluginManager.add( 'wordpress', function( editor ) {
 		}
 	});
 
-	// Word count
-	if ( typeof window.jQuery !== 'undefined' ) {
-		editor.on( 'keyup', function( e ) {
-			var key = e.keyCode || e.charCode;
-
-			if ( key === last ) {
-				return;
-			}
-
-			if ( 13 === key || 8 === last || 46 === last ) {
-				window.jQuery( document ).triggerHandler( 'wpcountwords', [ editor.getContent({ format : 'raw' }) ] );
-			}
-
-			last = key;
-		});
-	}
-
 	editor.on( 'SaveContent', function( e ) {
 		// If editor is hidden, we just want the textarea's value to be saved
 		if ( ! editor.inline && editor.isHidden() ) {