GNU bug report logs - #76051
29.4; Incorrect workarea entry in display-monitor-attributes-list on macOS

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From: Alan Third <alan <at> idiocy.org>
To: Anders Lindgren <andlind <at> gmail.com>
Cc: 76051 <at> debbugs.gnu.org
Subject: bug#76051: 29.4; Incorrect workarea entry in display-monitor-attributes-list on macOS
Date: Mon, 26 May 2025 20:34:25 +0100

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

On Tue, Feb 04, 2025 at 02:42:07PM +0100, Anders Lindgren wrote:
> Hi!

Hi Anders,

> I think the `display-monitor-attributes-list' function returns an incorrect
> `workarea' entry on macOS.
> 
> Concretely, I have a laptop with an external monitor connected. The
> external monitor is placed above to the left.
> 
> The `display-monitor-attributes-list' function returns the following
> (abbreviated):
> 
>     (((geometry 0 0 1728 1117) (workarea 0 38 1728 1079) ...
>      ((geometry -2560 -723 2560 1440) (workarea -2560 -638 2560 1330) ...))
> 
> The first member in the list describes the laptop monitor (the primary
> monitor), the second the external monitor.
> 
> The first two numbers, `X' and `Y', in each entry describe the position of
> the top left corner of the area, relative to the top left corner of the
> primary monitor.
> 
> The number that I think is incorrect is the `Y' of the workarea of the
> external monitor, which is "-638". It indicates that there is a (723-638 =
> 85 pixel area on top of the screen which is outside the work area.)
> 
> However, in reality, there is a 25 pixel menu bar which should be outside
> the work area. The 85 probably comes from the macOS dock, which is placed
> in the lower part of the screen.
> 
> The height field correctly includes both the menu bar and the dock.
> 
> I've tested this on Emacs 29.4 and 30.0.93 on macOS 15.1.

I'm pretty sure the arithmetic was wrong, and it was treating external
monitors differently from the primary screen for some reason I
couldn't work out.

Can you check if the attached looks right to you? I can't check as I
don't have an external monitor here.
-- 
Alan Third

[0001-Fix-NS-port-screen-geometry-report-bug-76051.patch (text/plain, attachment)]

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