Parsoid and the core parser render headings preceded by behavior switches differently
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	Vahurzpu
	Jan 16 2023, 4:55 AM

Description

The two parsers render

__NOINDEX__== Heading ==

differently. The core parser renders a heading, while Parsoid renders the raw wikitext (== Heading ==).

This syntax does exist in the wild; this bug report was prompted by a user on Discord asking why an SPI page looked weird in the mobile app.

This seems like the sort of thing that would have come up before, but I didn't see anything that looked the same in the "Known Differences" column.

	Subject	Repo	Branch	Lines +/-
	Treat behaviour switches as sol transparent in grammar	mediawiki/services/parsoid	master	+81 -10

And the grammar permits other SOL transparent constructs (comments, include tags) before headings,
https://gerrit.wikimedia.org/r/c/mediawiki/services/parsoid/+/141887

This is probably just a bug.

Change 880553 had a related patch set uploaded (by Arlolra; author: Arlolra):

[mediawiki/services/parsoid@master] [WIP] Treat behaviour switches as sol transparent in grammar

Change 880553 merged by jenkins-bot:

[mediawiki/services/parsoid@master] Treat behaviour switches as sol transparent in grammar