5c012a1184 [MM-61894] Keep markdown formatting when pasting text copied from a message (#38287)
* MM-61894: keep markdown when pasting a copied message

The paste handler only converted pasted HTML into markdown when it held a
table or a link, so copying a rendered message out of a channel and pasting
it dropped headings, lists, emphasis and code. It now converts any HTML that
carries formatting markdown can express, and Turndown knows how to read back
the markup Mattermost renders for code blocks, channel links and hashtags.

Co-authored-by: mattermost-code <matty-code@mattermost.com>

* MM-61894: cover pasting a copied message with tests

Renders messages through the real Markdown component and pastes the resulting
markup back, so the tests exercise the markup a browser actually puts on the
clipboard.

Co-authored-by: mattermost-code <matty-code@mattermost.com>

* MM-61894: lengthen code-block fences past inner backticks

When a copied Mattermost code block contains ```, a hardcoded three-backtick
fence would close early. Size the fence from the longest run in the code.

Co-authored-by: mattermost-code <matty-code@mattermost.com>

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: mattermost-code <matty-code@mattermost.com>
2026-10-19 17:11:33 -04:00
2026-10-04 12:35:53 +08:00
2018-05-30 10:23:25 -04:00

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