bacbbbd628
Java applications might use override-redirect windows as parent windows for top-level windows, although this is not following the standard [1]. In such case, the first non-override-redirect child window that is created was marked as being on_all_workspaces since the call to should_be_on_all_workspaces() returns TRUE for its parent, and this even though the on_all_workspaces_requested bit is unset. When a further child of this window was added, it was set as not having a workspace and not being on_all_workspaces, since the call to should_be_on_all_workspaces() for its parent would return FALSE (unless if it is in a different monitor, and the multiple-monitors workspaces are disabled). Since per commit 09bab98b we don't recompute the workspace if the on_all_workspaces bit is unset, we could end up in a case where a window can be nor in all the workspaces or in a specific workspace. So let's just ignore the transient_for bit for a window if that points to an override-redirect, using the x11 root window instead. Add a stacking test to verify this scenario (was failing before of this commit). Fixes https://gitlab.gnome.org/GNOME/mutter/issues/885 https://gitlab.gnome.org/GNOME/mutter/merge_requests/895 [1] https://standards.freedesktop.org/wm-spec/wm-spec-latest.html#idm140200472512128
Mutter
Mutter is a Wayland display server and X11 window manager and compositor library.
When used as a Wayland display server, it runs on top of KMS and libinput. It implements the compositor side of the Wayland core protocol as well as various protocol extensions. It also has functionality related to running X11 applications using Xwayland.
When used on top of Xorg it acts as a X11 window manager and compositing manager.
It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.
Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork af Clutter, a scene graph and user interface toolkit.
Mutter is used by, for example, GNOME Shell, the GNOME core user interface, and by Gala, elementary OS's window manager. It can also be run standalone, using the command "mutter", but just running plain mutter is only intended for debugging purposes.
Contributing
To contribute, open merge requests at https://gitlab.gnome.org/GNOME/mutter.
The coding style used is primarily the GNU flavor of the GNOME coding
style
with some minor additions such as preferring stdint.h types over GLib
fundamental types, and a soft 80 character line limit. However, in general,
look at the file you're editing for inspiration.
Commit messages should follow the GNOME commit message guidelines. We require an URL to either an issue or a merge request in each commit.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.