The code added in Id12cbe4a is creating a frame from the parser object
before actually starting a parse, meaning the frame ends up with no
title, which causes problems for other stuff that assumes the frame
*does* have a title.
While we could possibly change from calling ->preprocess() to
->recursivePreprocess() to avoid re-starting the parse, there are some
hooks called from ->preprocess() that it's probably best to continue
calling to not break BC.
Bug: 66798
Change-Id: If2ca8ab94ab81ee10f33ce1f4ee75655b7c1e680
// if they didn't want any output except (probably) the parse tree,
// then don't bother actually fully expanding it
if ( $prop || $params['prop'] === null ) {
+ $wgParser->startExternalParse( $title_obj, $options, OT_PREPROCESS );
$frame = $wgParser->getPreprocessor()->newFrame();
$wikitext = $wgParser->preprocess( $params['text'], $title_obj, $options, null, $frame );
if ( $params['prop'] === null ) {