Arlo Breault 1855c046ac Add media info in a post-processing pass ... The basic idea here is to generate the media structure in the token stream using a stuffed span with a redlink, as in T169975, and augmenting the nodes on the DOM once the media info has been fetched. A redlink is justified as the canonical representation of the media elements before info is fetched because it's the fallback if fetching fails and the media type is unknown until the info is retrieved. Most options are stored in data-mw until the media type is fetched and it's determined that they're applicable. This is a bit of a reversion of how things were done before where inapplicable options were removed post-facto. For consistency and styling's sake, figcaptions are now always added to block figures. The pass has to be run before generating headings anchor, since that depends on the text content (ie. redlinks). This rearranges things in the post-processor and adds another pass. The post-processing pass to add media info is run on subpipelines as well as the top level so that the media info is present in cases where we embed HTML in data-mw (which is currently skipped by the top level only passes, except for the cite extension, which has special handling, see T214994) and to avoid an additional post-processing pass for the gallery extension, which scales media of packed galleries. This comes at the cost of making additional queries for each pipeline and requires the add media pass to be idempotent. Filed T214241 for figuring out what to do about data-mw info being clobbered by template annotations. The newly failing blacklisted tests are from roundtripping media options in galleries, which requires a general refactor for support. See the FIXMEs added there. Performance should be expected to regress by the amount of work we're able to overlap in the async phase of the pipeline while the media info is being fetched. Considering a lot of that work is caught up waiting for the batch to return (other async requests are found in the same batch), this doesn't turn out to be much in practice in the average case. Bug: T153080 Bug: T169975 Change-Id: I856ee962b70cef1f8d49652396ea5264e11a8ade		2019-02-01 13:30:07 -08:00
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Cite	Add media info in a post-processing pass	2019-02-01 13:30:07 -08:00