GNU bug report logs - #76275
31.0.50; frame-inhibit-implied-resize broken on recent master

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From: martin rudalics <rudalics <at> gmx.at>
To: Sean Whitton <spwhitton <at> spwhitton.name>
Cc: 76275 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>, shipmints <at> gmail.com
Subject: bug#76275: 31.0.50; frame-inhibit-implied-resize broken on recent master
Date: Mon, 17 Feb 2025 10:21:34 +0100

[Message part 1 (text/plain, inline)]

> This frame has no toolbar, because it's a (minibuffer . only) frame.
> Did you notice that?  I don't know whether it's significant.

Hopefully not.  The tool_bar_resized flag should be set regardless of
whether a tool bar was made or not.  This is emphasized by this comment
in xdisp.c:

      /* Even if we do not display a tool bar initially, still pretend
	 that we have resized it already.  This avoids that a later
	 activation of the tool bar resizes the frame, despite of the
	 fact that a setting of 'frame-inhibit-implied-resize' should
	 inhibit it (Bug#52986).  */
      f->tool_bar_resized = true;

>> Are you sure you did something like
>>
>>        if (!FRAME_LIVE_P (f)
>> 	  || !f->can_set_window_size
>> 	  || !f->after_make_frame
>> 	  || !f->tool_bar_resized
>> 	  || FRAME_TOOLTIP_P (f)
>> 	  || !(frame_window_change
>> 	       || frame_selected_change
>> 	       || frame_selected_window_change
>> 	       || frame_window_state_change))
>> 	/* Either we are not allowed to run hooks for this frame or no
>> 	   window change has been reported for it since the last time
>> 	   we ran window change functions on it.  */
>> 	continue;
>>
>> If that hook is still run, we'd have to find out why.
>
> Oops.  I patched run_window_configuration_change_hook, not
> run_window_change_functions.  Sorry about that!  So, let me go back to
> the debugging instructions in your previous e-mail.

Should teach me to always include a diff when proposing changes.

> First I tried the unpatched code and printed the three variables.  My
> breakpoint was hit eight times and in each case, f->can_set_window_size
> and f->after_make_frame were true, and f->tool_bar_resized was false.

Sounds encouraging.

> Then I patched in the check for f->tool_bar_resized.  This makes the
> problem not reproducible.

OK.  So to fix your problem the attached patch suffices?  I also patched
the corresponding part for running the configuration change hook.

>> I am also stupefied by the fact that the
>>
>>>       (with-selected-frame frame
>>>         (apply #'completing-read prompt collection optional-args))))
>>
>> is apparently needed.  WOW a pure 'make-frame' together with the hook on
>> 'window-size-change-functions' is _not_ sufficient.  Right?
>
> Yes, I just reconfirmed this.

Whatever it does, it triggers the hook.

>> Is the
>>
>> (apply #'completing-read prompt collection optional-args))))
>>
>> needed literally or would just selecting the frame suffice?  Or does
>> ‘completing-read’ trigger the window size change that puts the bad
>> sequence in motion?
>
> I just tested this.  I replaced
>
> --8<---------------cut here---------------start------------->8---
>      (with-selected-frame frame
>        (apply #'completing-read prompt collection optional-args))
> --8<---------------cut here---------------end--------------->8---
>
> with
>
> --8<---------------cut here---------------start------------->8---
>      (select-frame frame)
> --8<---------------cut here---------------end--------------->8---
>
> and then, indeed, the problem is not reproducible.  So just selecting
> the frame does *not* suffice.

It probably would suffice to show another buffer in that window.

>> One other thing: Would enlarging the scope via
>>
>> (defun spw/scale-default (frame)
>>    (let ((frame-inhibit-implied-resize t))
>>      (set-face-attribute 'default frame :height 120)))
>>
>> change anything?
>
> I just tested this.  No, it doesn't help.  The problem is still
> reproducible.

So likely the let-binding in 'make-frame' extends until here.  Can you
confirm that in your "My breakpoint was hit eight times and in each
case, ..." the value of the _variable_ frame_inhibit_implied_resize was
always t while the function with the same name returned false?

martin

[frame-tool-bar-resized.diff (text/x-patch, attachment)]

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