mw.Title.js: substr() with negative value not working in IE

Change-Id: I78a9f55ffb8e1d421ee81a101ed18c626f679210

diff --git a/resources/mediawiki/mediawiki.Title.js b/resources/mediawiki/mediawiki.Title.js
index e1031c6..de2d013 100644 (file)
--- a/resources/mediawiki/mediawiki.Title.js
+++ b/resources/mediawiki/mediawiki.Title.js
@@ -193,8 +193,8 @@
                                title.indexOf( '../' ) === 0 ||
                                title.indexOf( '/./' ) !== -1 ||
                                title.indexOf( '/../' ) !== -1 ||
-                               title.substr( -2 ) === '/.' ||
-                               title.substr( -3 ) === '/..'
+                               title.substr( title.length - 2 ) === '/.' ||
+                               title.substr( title.length - 3 ) === '/..'
                        )
                ) {
                        return false;