On 12.01.2012, 20:31 Daniel wrote:
The removal of $wgMessageCache->addMessage() broke manyextensions, some ours and some from mediawiki.org like SimpleForms. Some fixes just required use of the i18n file. Our more difficult issue was that we were injecting system messages into articles to add tracking categories. On advice from this list (thanks!), we used code patterned after Parser::addTrackingCategory() to inject categories and it works fine, actually much better than what we had.
I made addTrackingCategory() public a day before your email to make life easier for extension developers.