TinyMCE: fix the regex that removes spaces from empty paragraphs. Was causing problems when wpautop is disabled and there are many U+00A0 chars between the opening `<p>` and an inline tag. These chars are inserted by the browsers to maintain consecutive spaces typed by the users in contentEditable.

Fixes #35890.
Built from https://develop.svn.wordpress.org/trunk@36597


git-svn-id: http://core.svn.wordpress.org/trunk@36564 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -117,7 +117,15 @@ tinymce.PluginManager.add( 'wordpress', function( editor ) {
 			}
 
 			// Remove spaces from empty paragraphs.
-			event.content = event.content.replace( /<p>(?:&nbsp;|\u00a0|\uFEFF|\s)+<\/p>/gi, '<p><br /></p>' );
+			// Avoid backtracking, can freeze the editor. See #35890.
+			// (This is also quite faster than using only one regex.)
+			event.content = event.content.replace( /<p>([^<>]+)<\/p>/gi, function( tag, text ) {
+				if ( /^(&nbsp;|\s|\u00a0|\ufeff)+$/i.test( text ) ) {
+					return '<p><br /></p>';
+				}
+
+				return tag;
+			});
 		}
 	});
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36596';
+$wp_version = '4.5-alpha-36597';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.