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Add a parser option to do preSaveTransform within certain tag extensions
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As described in the wiki when an extension registers a new tag, signatures within the tag won't be expanded because preSaveTransform skips all registered tags.

I am currently working on an extension where it would be very useful to expand signatures within the tag of my extension.
And yes, I am aware of the {{#tag:tagname| workaround, however for my use case I need a tag instead of a parser function.

Another use case would be to allow the expansion of {{subst:}} within tag attributes, which would also be very handy.

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Related or duplicate: T4700 (that task is for a general solution, while this request it for a specific tag, maybe more a subtask as a duplicate)

Well I think that it would have to be a tag-specific setting. Because for some tags like <pre> and <syntaxhighlight> I think it's good that no preSaveTransform take place, but for other specific tags they would be desirable.

waldyrious awarded a token.
waldyrious added a subscriber: waldyrious.

I have written a patch implementing this a long time ago: (but I never tried to get it reviewed and merged).

I managed to come up with a workaround for my extension using the ParserPreSaveTransformComplete hook:

It only handles the expansion of ~~~~ and obviously also expands it in cases where it shouldn't but it works good enough that this task is no longer blocking a core feature of my extension :)