GNU bug report logs -
#78218
30.1; mouse-highlight variable does not work on macOS
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Message #11 received at 78218 <at> debbugs.gnu.org (full text, mbox):
Eli Zaretskii <eliz <at> gnu.org> writes:
>> auth-sender: rmorelli <at> q.com
>> Date: Fri, 2 May 2025 12:19:34 -0600
>> From: Robert Morelli <morelli <at> flux.utah.edu>
>>
>> According to the documentation for mouse-highlight, "If the value is an
>> integer, highlighting is shown only after moving the mouse, while
>> keyboard input turns off the highlight even when the mouse is over the
>> clickable text." This is not working, even if Emacs is started with
>> the --no-init option. I've checked with several independent builds on
>> macOS, versions 29 up to 30.1. I'm running macOS Sequoia 15.3.2.
>>
>> Note that the problem is especially distracting in situations where a
>> "vertical list" is invoked by a keyboard action but the mouse cursor
>> happens to be over an item of the list, in which case that item is
>>
>> highlighted, but with no functional significance.
>>
>> The specific context where this became problematic for me, is using
>> Vertico, and other similar packages, but the problem manifests in plain
>> Emacs with no third party packages installed.
>>
>> It took me some time to recognize where the highlighting was coming
>> from, even though I'm an experienced Emacs user, because I normally use
>> "mouse avoidance" features of Emacs, so generally don't expect the
>> mouse, which I'm not often using, to affect how I interact with Emacs.
>> Me belief is that this issue would create even more confusion for a new
>> Emacs user.
>
> This seems to be macOS specific (works for me on MS-Windows, and I see
> code for supporting this in xterm.c and pgtkterm.c). I've added to
> this conversation people who might be able to debug and fix this.
>
> Btw, do you see this in a GUI session or in a -nw session (or in
> both)?
This makes no sense to me:
nsterm.m:
6978 if (hlinfo->mouse_face_hidden && FIXNUMP (Vmouse_highlight))
6979 {
6980 clear_mouse_face (hlinfo);
6981 hlinfo->mouse_face_hidden = 1;
6982 }
Why set hidden to true when it is already? There is probably a '!'
missing. Maybe someone with a GUI Emacs can check if that works.
Not sure if this was ever implemented for ttys. I can't find it.
This bug report was last modified 47 days ago.
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