Populate ParserCache with Parsoid output as a post-edit hook
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	cscott
	Dec 15 2021, 9:08 PM

Description

This will serve a number of purposes: 1. pre-warm the parser cache and ensure that Parsoid read views don't cause user-visible latency increases, 2. Allow us to do visual diff testing between parsoid read views and legacy read views (T310510), 3. Allow us to do "metadata comparison testing" to verify that parsoid is generating the same lists of categories, language links, and all the other ParserOutput metadata in the post-edit pipeline that core is.

There will be a 'useParsoid' flag in ParserOptions (T300191: Bikeshed name of 'useParsoid' flag in ParserOptions) to fork the cache for this content.

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Status	Subtype	Assigned	Task
Open	Release	None	T84936 Release VisualEditor-MediaWiki as "1.0"
Open		None	T50429 [Epic] Support editing parts of a page in VisualEditor-MediaWiki
Open		None	T54365 Explore performance gains from progressive (JIT?) de-alienation in VisualEditor
Open		None	T174303 Copy-pasting linked ISBN numbers from view mode HTML into VisualEditor inserts wikitext links to Special:BookSources (it should turn them into magic links?)
Open	Feature	None	T54091 The read HTML should have hinting to allow full DOM copying (as opposed to just rich copying) from read mode into VE surfaces
Open		None	T55784 [EPIC] Use Parsoid HTML for all page views
Open		None	T272987 [EPIC] Parsoid read views for DiscussionTools
Open		None	T297840 Populate ParserCache with Parsoid output as a post-edit hook
Resolved		ssastry	T310510 Discussion tools visual diff testing between parsoid read views and legacy read views
Open		None	T310511 Metadata comparison testing between Parsoid and the legacy parser
Open		None	T310512 Parsoid and the legacy parser should emit exactly the same ParserOutput metadata
Open		None	T305159 Improve coverage of the ContentMetadataCollector interface
Open		None	T292865 Plumb revision information from ParserOptions through to ParserOutput (bypassing Parsoid)
Open		None	T292868 Migrate boolean flags in ParserOutput to ::setFlag() or ::setOutputFlag() or ::setExtensionData()
Open		None	T293513 Deprecate and remove ParserOutput::setTOCHTML()
Resolved		cscott	T295169 Parser TOC placeholder should be a meta tag
Open		None	T295168 Ensure <meta typeof="..."> in Parser/Parsoid HTML can't be spoofed from wikitext
Resolved		matmarex	T218330 Table of contents HTML may be unbalanced
Open		None	T293514 Unify ParserOutput::{get,set}{TitleText,DisplayTitle}
Open		None	T296019 Improve ParserOutput::setLanguageLinks() / ::addLanguageLink()
Open		None	T296037 ParserOutput::addImage() should take a LinkTarget
Resolved		cscott	T296023 Parsoid needs a core-compatible LinkTarget interface
Open		None	T296038 ParserOutput::addTemplate() interaction with ParserOptions::getTemplateCallback()
Resolved		None	T296025 ParserOutput::setSections() should be more structured
Open		None	T324035 Add "title" as a property of TOCData
Open		None	T296036 Deprecate and remove ParserOutput::isLinkInternal() (or at least mark it as @internal)
Open		None	T300979 Ensure ParserOutput can always be combined asynchronously/out-of-order
Open		None	T300307 Ensure JsConfigVars can always be combined asynchronously/out-of-order
Open		cscott	T300980 Store page indicators as a set; select one at output time
Open		None	T300981 Ensure extensionData can always be combined asynchronously/out-of-order
Open		None	T301004 Use OutputPage::appendExtensionData for wikibase-otherprojects-sidebar
Open		None	T300986 Ensure Page Properties can always be combined asynchronously/out-of-order
Resolved		cscott	T353530 Category defaultsort should be applied in CategoryLinkTable.php
Open		None	T296345 Add ParserOutput::addOutputData() to unify various accumulators in ParserOutput
Open		None	T296352 ParserOutput::addWarningMsg() should take a MessageValue instead of a string
Open		None	T296353 Create composer library for includes/libs/Message
Resolved	BUG REPORT	Jgiannelos	T351931 With parsoid categories are not shown
Open		None	T357048 Parsoid needs to call ParserOutput::addLink with a link batch
Resolved	BUG REPORT	Jgiannelos	T358950 Local interlanguage links don’t work with Parsoid read views