(bug 28649) use $wgContLang->truncate on log action comments to avoid half eaten unicode chars and also adds a nice '...'

Patch by Umherirrender.

RELEASE-NOTES-1.19

@@ -70,6 +70,8 @@ production.
   warnings/notices to be thrown.
 * (bug 30335) Fix for HTMLForms using GET breaking when non-friendly URLs are
   used
+* (bug 28649) Avoiding half truncated multi-byte unicode characters when 
+  truncating log comments.
 
 === API changes in 1.19 ===
 * (bug 19838) siprop=interwikimap can now use the interwiki cache.

includes/LogPage.php

@@ -416,6 +416,8 @@ class LogPage {
 	 * @param $doer User object: the user doing the action
 	 */
 	public function addEntry( $action, $target, $comment, $params = array(), $doer = null ) {
+		global $wgContLang;
+
 		if ( !is_array( $params ) ) {
 			$params = array( $params );
 		}
@@ -424,6 +426,9 @@ class LogPage {
 			$comment = '';
 		}
 
+		# Truncate for whole multibyte characters.
+		$comment = $wgContLang->truncate( $comment, 255 );
+
 		$this->action = $action;
 		$this->target = $target;
 		$this->comment = $comment;