From: Dmitry Gutov <dmitry@gutov.dev>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 71866@debbugs.gnu.org
Subject: bug#71866: 30.0.50; [macOS] Cursor hiding char behind it with certain theme customization
Date: Tue, 2 Jul 2024 04:07:11 +0300 [thread overview]
Message-ID: <03b9a1c2-986d-40ea-bdd6-d13b419c9aa0@gutov.dev> (raw)
In-Reply-To: <86frstfiop.fsf@gnu.org>
On 01/07/2024 14:36, Eli Zaretskii wrote:
>> Date: Mon, 1 Jul 2024 06:14:28 +0300
>> From: Dmitry Gutov <dmitry@gutov.dev>
>>
>> Repro script is attached. Disabling blink-cursor-mode is not a
>> hard requirement, but it makes the bug easier to see. The font and face
>> customizations are both necessary.
>>
>> 1. emacs -Q -l nocursor-repro.el
>> 2. Type 'asdasd' (without quotes)
>> 3. Move point to either of the 's' chars
>> 4. Create a new frame with 'C-x 5 2'
>>
>> The character under cursor won't be visible - just a blank cell (the
>> cursor is blank as well). Then I move point with e.g. C-f and it's
>> visible again.
>
> This is definitely macOS specific. I cannot reproduce on my system
> (although by some miracle I do have the Cascadia Mono font installed).
> Basically, what happens is that redisplay has some bug in how it draws
> the cursor. Given all the tricks that redisplay plays on macOS, I'm
> not surprised.
Indeed, it never happens on my Linux system either. Thanks for checking
anyway.
> On other platforms, the code which draws the cursor is in draw_glyphs,
> called from XXX_draw_window_cursor function (where XXX is the GUI
> backend, in your case probably XXX = ns). If the same is true on
> macOS, you could try stepping through that code.
I can try following some more detailed instructions. I.e. I can set up a
breakpoint, but would there be anything to look out for when stepping
through the code?
BTW, this happens only right after I switch frames. Things start looking
right again if I simply move point.
>> The face customization is a part of a 3rd party theme (tango-plus). I'm
>> pretty sure the :inverse-video customization should be a no-op but it
>> isn't. Seems like a subtle bug somewhere. As a user of the theme it's
>> taken me a while to narrow down the problem, so it'd be great if someone
>> could look into it.
>
> So if inverse-video is not used, the problem goes away? If so, just
> don't use it.
Yeah, I plan on submitting a patch to that effect to the theme.
But the bug looks odd enough and the same time very stable, that I think
it's worth investigating.
next prev parent reply other threads:[~2024-07-02 1:07 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-01 3:14 bug#71866: 30.0.50; [macOS] Cursor hiding char behind it with certain theme customization Dmitry Gutov
2024-07-01 11:36 ` Eli Zaretskii
2024-07-02 1:07 ` Dmitry Gutov [this message]
2024-07-06 8:56 ` Eli Zaretskii
2024-07-09 2:37 ` Dmitry Gutov
2024-07-09 11:31 ` Eli Zaretskii
2024-07-10 2:46 ` Dmitry Gutov
2024-07-10 11:58 ` Eli Zaretskii
2024-07-19 1:57 ` Dmitry Gutov
2024-07-20 8:30 ` Eli Zaretskii
2024-07-20 15:46 ` Dmitry Gutov
2024-07-20 16:03 ` Eli Zaretskii
2024-07-21 0:53 ` Dmitry Gutov
2024-07-21 7:20 ` Eli Zaretskii
2024-07-21 9:04 ` Eli Zaretskii
2024-07-21 23:22 ` Dmitry Gutov
2024-07-21 13:50 ` Dmitry Gutov
2024-07-21 14:55 ` Eli Zaretskii
2024-07-21 23:58 ` Dmitry Gutov
2024-07-22 14:45 ` Eli Zaretskii
2024-07-22 15:27 ` Alan Third
2024-07-22 16:02 ` Alan Third
2024-07-23 1:11 ` Dmitry Gutov
2024-07-23 11:19 ` Eli Zaretskii
2024-07-24 0:48 ` Dmitry Gutov
2024-07-24 11:32 ` Eli Zaretskii
2024-07-24 14:34 ` Dmitry Gutov
2024-07-24 16:29 ` Eli Zaretskii
2024-07-24 19:22 ` Dmitry Gutov
2024-07-24 20:08 ` Dmitry Gutov
2024-07-25 5:01 ` Eli Zaretskii
2024-07-25 16:14 ` Dmitry Gutov
2024-07-22 16:10 ` Eli Zaretskii
2024-07-22 19:02 ` Alan Third
2024-07-22 19:15 ` Eli Zaretskii
2024-07-22 19:47 ` Alan Third
2024-07-23 1:06 ` Dmitry Gutov
2024-07-23 11:17 ` Eli Zaretskii
2024-07-02 23:42 ` Stefan Kangas
2024-07-07 2:03 ` Dmitry Gutov
2024-07-09 18:22 ` Stefan Kangas
2024-07-10 2:56 ` Dmitry Gutov
2024-07-23 7:40 ` Gerd Möllmann
2024-07-24 0:56 ` Dmitry Gutov
2024-07-24 3:48 ` Gerd Möllmann
2024-07-24 19:16 ` Dmitry Gutov
2024-07-25 3:03 ` Gerd Möllmann
2024-07-25 5:39 ` Eli Zaretskii
2024-07-25 5:58 ` Gerd Möllmann
2024-07-25 14:46 ` Dmitry Gutov
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