GNU bug report logs - #79846
Margins broken with left scroll bar

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: bug-gnu-emacs <at> gnu.org
Subject: Margins broken with left scroll bar
Date: Sun, 16 Nov 2025 19:12:52 +0200

`./configure --with-x-toolkit=lucid` by default enables the scroll bar
on the left.  This breaks mouse clicks on the left margin.

However, this bug is reproducible on any build after enabling
the scroll bar on the left:

0. emacs -Q
1. Menu -> Options -> Show/Hide -> Scroll Bar -> On the Left
2. Eval:

(progn
  (setq-local left-margin-width 1)
  (set-window-buffer nil (window-buffer))
  (overlay-put
   (make-overlay (point-min) (1+ (point-min)))
   'before-string
   #("!" 0 1
     (display
      ((margin left-margin)
       #("!" 0 1
	 ( face warning
	   keymap
	   (keymap
	    (left-margin
	     . (keymap
		(mouse-1
		 . (lambda ()
		     (interactive)
		     (message "CLICKED %S" last-command-event)))))))))))))

3. Click on the margin indicator:

  <left-margin> <mouse-1> is undefined

Message #8 received at 79846 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Juri Linkov <juri <at> linkov.net>, 79846 <at> debbugs.gnu.org
Subject: Re: bug#79846: Margins broken with left scroll bar
Date: Mon, 17 Nov 2025 10:53:05 +0100

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

> `./configure --with-x-toolkit=lucid` by default enables the scroll bar
> on the left.  This breaks mouse clicks on the left margin.
>
> However, this bug is reproducible on any build after enabling
> the scroll bar on the left:

Does it work with the attached diff?  Setting col to 0 should work as
well.

martin

[keyboard.c.diff (text/x-patch, attachment)]

Message #11 received at 79846 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 79846 <at> debbugs.gnu.org
Subject: Re: bug#79846: Margins broken with left scroll bar
Date: Mon, 17 Nov 2025 19:09:07 +0200

>> `./configure --with-x-toolkit=lucid` by default enables the scroll bar
>> on the left.  This breaks mouse clicks on the left margin.
>>
>> However, this bug is reproducible on any build after enabling
>> the scroll bar on the left:
>
> Does it work with the attached diff?  Setting col to 0 should work as
> well.

Thanks, I confirm this works at least with gtk and lucid toolkits,
and surely with others.

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