Thread:Project:Support desk/Hooks/DiffViewHeader doesn't support 4th parameter

I've tried to use DiffViewHeader and code here (Line 26 to 28): and result here: Warning: Missing argument 4 for {closure} in *****censored*****.php on line 26 DifferenceEngine Object (   [mOldid] => 3    [mNewid] => 4    [mOldTags] =>     [mNewTags] =>     [mOldContent] =>     [mNewContent] =>     [mDiffLang:protected] =>     [mOldPage] => Title Object        ( blahblahblah.

When I remove  on line 26, Warning does not appear.

Does 1.22 really support ?

Addition: includes/diff/DifferenceEngine.php (Line 256, MediaWiki 1.22.2) It doesn't seem to support.