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bug#42887: 28.0.50; Customize Group doesn't show/hide option on repeated

From: Mauro Aranda
Subject: bug#42887: 28.0.50; Customize Group doesn't show/hide option on repeated clicking
Date: Tue, 17 Nov 2020 09:07:28 -0300

Stefan Kangas <stefan@marxist.se> writes:

> Mauro Aranda <maurooaranda@gmail.com> writes:
>> Stefan Kangas <stefan@marxist.se> writes:
>>> Mauro Aranda <maurooaranda@gmail.com> writes:
>>>> Only when I click "too fast" the option doesn't expand,
>>> That's different from what I'm seeing.  I can wait several seconds
>>> between clicks, and as long as I don't move the mouse cursor the option
>>> won't expand.
>> I think I misunderstood your recipe.  Does an option that starts as hidden
>> never expand for you in the recipe?
> No, it does expand on the first click.
> It will not expand on repeated clicks unless I move the mouse cursor
> between clicks.  The delay does not matter (except if I click too fast I
> see double-click events).

Then I definitely can't reproduce this.  Does it happen with mouse-1 and
mouse-2? I think you didn't mention that in your recipe.

> So I had a quick look, and the defun `custom-toggle-hide-variable' is
> called on the first click.  The option then correctly expands.
> But that function is not called on subsequent clicks.  After moving the
> mouse cursor and clicking, it seems to register again and
> `custom-toggle-hide-variable' is called.

custom-toggle-hide-variable is the :action function for the widget you
are clicking.  It should be called if
widget-button--check-and-call-button detects a mouse-1 or mouse-2 event
at that widget.  AFAIK, there are 2 reasons why it doesn't
call the :action function: either it gets a mouse-1 event and then a
mouse-movement event, returning t, or it doesn't think the button where
the mouse click ended is the same button where the mouse click started.
I.e., this evaluates to nil:
(and pos (eq (get-char-property pos 'button) button))
In this case, widget-button--check-and-call-button will return nil.

I suspect the former happens and not the latter, but I can't be sure.
Maybe you can test what's the return value of

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