GNU bug report logs - #63395
HiDPI/GTK: menubar height scaled twice in xg_update_frame_menubar()

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From: Tobias Bading <tbading <at> web.de>
To: 63395 <at> debbugs.gnu.org
Subject: bug#63395: HiDPI/GTK: menubar height scaled twice in xg_update_frame_menubar()
Date: Tue, 9 May 2023 20:22:53 +0200

It looks like

--- %< ---

commit 401ccb0b9c697fd3af026a72b6621a692e206aea
Author:     Po Lu <luangruo <at> yahoo.com>
AuthorDate: Wed Jan 26 13:53:20 2022 +0800
Commit:     Po Lu <luangruo <at> yahoo.com>
CommitDate: Wed Jan 26 13:53:20 2022 +0800

    Fix GTK menu bar height reporting when scaled

    * src/gtkutil.c (xg_update_frame_menubar): Multiply requisition
    height by GDK scale.

M       src/gtkutil.c

--- >% ---

tried to correct a problem that was already fixed by

--- %< ---

commit a05bafffdcb88df74408a8402cafc9829407c1e5
Author:     Tobias Bading <tbading <at> web.de>
AuthorDate: Wed Nov 27 16:51:26 2019 +0100
Commit:     Robert Pluim <rpluim <at> gmail.com>
CommitDate: Tue Dec 3 08:54:31 2019 +0100

    Fix incorrect GTK menus on HiDPI monitors with scaling factor > 1

    This should fix Bug#31223, Bug#28106, Bug#23672 as well as Ubuntu bug
    https://bugs.launchpad.net/ubuntu/+source/emacs25/+bug/1695228

    Also fixes the formerly unscaled Y value returned by
    frame-monitor-workarea (and display-monitor-attributes-list).

    For details on why some GTK menus were empty please see thread
    https://lists.gnu.org/archive/html/emacs-devel/2019-11/msg01061.html

    * src/gtkutil.c (menubar_map_cb, xg_update_frame_menubar): Scale up
    req.height so that the menu bar's height is in device pixels as
    expected.
    (xg_event_is_for_menubar): Scale down rec.x and rec.y so that
    gtk_widget_intersect() works as intended.
    * src/xfns.c (Fx_display_monitor_attributes_list): Scale work.x and
    work.y up to be in device pixels.

    Copyright-paperwork-exempt: yes

M       src/gtkutil.c
M       src/xfns.c

--- >% ---

In emacs-29 as well as master req.height in xg_update_frame_menubar() is now
multiplied with xg_get_scale(f) twice. As a result my window manager (Compiz
from Ubuntu 20.04.6 LTS) assumes that the Emacs frame wouldn’t fit into the
monitor’s workarea and ignores my requested position.

Reverting 401ccb0b9c697fd3af026a72b6621a692e206aea fixes this for me.

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