https://bugs.kde.org/show_bug.cgi?id=454756
Bug ID: 454756
Summary: KWin on X11 doesn't support _GTK_SHOW_WINDOW_MENU
hint/message.
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: emi...@crisal.io
Target Milestone: ---
Created attachment 149407
--> https://bugs.kde.org/attachment.cgi?id=149407&action=edit
Test program which does what I want to do on Firefox
(Please move the component if I got it wrong)
SUMMARY
GTK has a `gdk_window_show_window_menu` API, which is useful to show the
context menu on applications that use CSD:
* https://docs.gtk.org/gdk3/method.Window.show_window_menu.html
On Wayland, this is implemented via `xdg_toplevel::show_window_menu` and it
works as expected on KWin:
https://wayland.app/protocols/xdg-shell#xdg_toplevel:request:show_window_menu
On X11, however, it's implemented using a WM hint+message called
`_GTK_SHOW_WINDOW_MENU`, used like this:
https://gitlab.gnome.org/GNOME/gtk/-/blob/ad5c3168a9f21c3f387df09ce5cd501a9ea1b2d8/gdk/x11/gdksurface-x11.c#L4769-4796
For parity, it'd be great to have it supported on X11 too.
One example where this doesn't work is Firefox's PiP window. Right-clicking
there on KWin-on-Wayland, or in GNOME (Wayland or X11), shows the native
context-menu to allow to move / position / etc the window.
I wanted to extend this so that we also allow showing the native menu where
using CSD / not showing the native titlebar in
https://phabricator.services.mozilla.com/D147771. However on Plasma+X11 it
doesn't do anything, which is unfortunate.
STEPS TO REPRODUCE
1. `python <test-program>`
2. Right-click on the window area. See a context menu pop up.
3. Click on the context menu item.
OBSERVED RESULT
Nothing
EXPECTED RESULT
A popup, like on Wayland, with the native menu.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Trunk
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