GNU bug report logs - #76321
31.0.50; Moving nested child frames out of their child parents

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Message #11 received at 76321 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: 76321 <at> debbugs.gnu.org
Cc: Martin Rudalics <rudalics <at> gmx.at>
Subject: Re: bug#76321: 31.0.50; Moving nested child frames out of their
 child parents
Date: Sun, 16 Feb 2025 07:02:48 +0100

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>
>> This bug is for something Martin Rudalics found:
>>
>> There's a problem with moving nested child frames out of their child
>> parents.  Load the attached tty-child-frames.el do first M-l and then
>> C-M-l.  You should see a grey child frame embedded in an orange child
>> frame.  Now do
>>
>> (set-frame-parameter tty-3 'left (- 30))
>
> An observation: When I modify the frame creation like this
>
> (defun tty-3 ()
>   (interactive)
>   (setq tty-3
> 	(make-frame
> 	 `((parent-frame . ,tty-2)
> 	   (left . (- 30)) (top . 5)
>                    ^^^^^^
> 	   (width . 10) (height . 5)
>
> and then do M-l and C-M-l, tty-3 is displayed at a different location
> than after the modify-frame-parameter. This is an indication that there
> is an inconsistency somewhere.
>
> Elisp info says about frame parameter 'left':
>
>      ‘(- POS)’
>           This specifies the position of the right frame edge relative
>           to the right edge of the display or parent frame.  The integer
>           POS may be positive or negative; a negative value specifies a
>           position outside the screen or parent frame or on a monitor
>           other than the primary one (for multi-monitor displays).
>
> Parent frame tty-2 of tty-3 has
>
> 	 `((parent-frame . ,root-frame)
> 	   (left . 40) (top . 5)
> 	   (width . 30) (height . 20)
>
> tty-2's right edges is at 40 + 30 = 70, in root coordinates.
>
> So, the right edge of tty-3 should land at 70, which makes its left edge
> should be 70 - 10 = 60.
>
> That is absolutely not what I'm seeing, neither with the initial (- 30)
> for left nor after modify-frame-parameters. So I guess my reading of
> Elisp info is wrong?
>
> Martin, could you please help me with this? What is the intended effect
> of the (- 30), do you know?

Forgot to CC Martin, of course. 

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