ApiStashEdit, editing, and parsing

[mwjames]

MediaWiki's ApiStashEdit is responsible that for each edit attempt (empty or not) an API call is made and with that request a full parse of the page content is executed resulting in embedded parser functions (e.g. #show/#ask) being executed as well.

For those who enabled #1251, the query cache is used and avoids possible #show/#ask Store connections during those stash edits and will output something like:

Title::getRestrictionTypes: applicable restrictions to [[Lorem ipsum-2baa]] are {edit,move}
User::pingLimiter: adding record for mediawiki:limiter:stashedit:ip:127.0.0.1 (limit 30 in 60s)
Unstubbing $wgParser on call of $wgParser::preSaveTransform from WikiPage->prepareContentForEdit
Parser: using preprocessor: Preprocessor_DOM
[MessageCache] MessageCache::load: Loading en... local cache is empty, got from global cache
[Preprocessor] Cached preprocessor output (key: mw-master:preprocess-xml:8ef108a578f78ed4e79aca817362e6f6:0)
Unstubbing $wgLang on call of $wgLang::_unstub from ParserOptions->__construct
[Preprocessor] Loaded preprocessor output from cache (key: mw-master:preprocess-xml:8ef108a578f78ed4e79aca817362e6f6:0)
[smw] SMW\Query\Result\CachedQueryResultPrefetcher::newQueryResultFromCache (sec): 0.00251 (8a8be490076aa932437d10998b2a6a28)
[smw] SMW\Utils\BufferedStatsdCollector::recordStats (as waitable DeferrableUpdate)
[smw] SMW\Query\Result\CachedQueryResultPrefetcher::newQueryResultFromCache (sec): 0.00053 (05272fde6584275bc50f4d3f54377a75)
[smw] SMW\Utils\BufferedStatsdCollector::recordStats (fingerprint: f2d0b14cf14cc570a0499628bc538581 is already listed therefore skip)
[Preprocessor] Loaded preprocessor output from cache (key: mw-master:preprocess-xml:8ef108a578f78ed4e79aca817362e6f6:0)
Title::getRestrictionTypes: applicable restrictions to [[Lorem ipsum-2baa]] are {edit,move}
Title::getRestrictionTypes: applicable restrictions to [[Lorem ipsum-2baa]] are {edit,move}
[StashEdit] Cached parser output for key 'mw-master:prepared-edit:a7b2350193f5b4ebfd5df9e963b6e18b:18e48319eafc9b4219964fa0f9152a1c6090e84d:90f42dc8c99187877261a42fd0a194b3' ('Lorem ipsum-2baa').