https://bugzilla.wikimedia.org/show_bug.cgi?id=69108

            Bug ID: 69108
           Summary: LivePreview doesn't allow interaction with page
                    content outside of #wikiPreview (it is not passed to
                    mw.hook)
           Product: MediaWiki
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: JavaScript
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
            Blocks: 39272, 51029, 30713
       Web browser: ---
   Mobile Platform: ---

Currently, LivePreview only passes the $wikiPreview to the hook
https://github.com/wikimedia/mediawiki-core/blob/master/resources/src/mediawiki.action/mediawiki.action.edit.preview.js#L101
but the script changes the page content in many other places:
https://github.com/wikimedia/mediawiki-core/blob/master/resources/src/mediawiki.action/mediawiki.action.edit.preview.js#L31-L43
The new content for these parts should also be made available to the user, by
passing them to the hook (as VisualEditor does, for example
https://github.com/wikimedia/mediawiki-extensions-VisualEditor/blob/ccdc215a9882d6bb3e079ca822f64c9089c0d363/modules/ve-mw/init/targets/ve.init.mw.ViewPageTarget.js#L1574
).

This would allow scripts like
https://en.wikipedia.org/w/index.php?title=MediaWiki:Gadget-featured-articles-links.js&oldid=619815637
to update the modifications of the language links after the user makes some
changes and use the live preview (in the example, the "badges" for
featured/good articles in other languages).

Also, this is likely what UniversalLanguageSelector needs in order to fix bug
51029.

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