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From: Stefan Monnier via "Bug reports for GNU Emacs,
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Subject: bug#74410: 31.0.50; completion-at-point doesn't work in custom buffers
Date: Wed, 20 Nov 2024 18:31:07 -0500
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In-Reply-To: <871pz62v0o.fsf@mail.linkov.net> (Juri Linkov's message of "Wed, 
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Xref: news.gmane.io gmane.emacs.bugs:295705
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> Currently this works only when typing 'M-x completion-at-point RET',
> not by 'M-C-i' that is bound to 'widget-complete'.  Maybe
> 'M-C-i' should be rebound to 'completion-at-point' in widgets?

Maybe it would make even more sense to just remove the `widget-complete`
binding since M-TAB should already be bound appropriately, but the
problem is that we don't know that the code which inserts the widget
into a buffer has properly setup the `completion-at-point-functions`
hook for `completion-at-point` to work.

Maybe we should try and detect when that is not the case and emit
a warning if so (with the hope to be able to obsolete `widget-complete`
in some future version).


        Stefan