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When the MetaWindow resize machinery for toplevels ended up in the Wayland window implementation, we tried to avoid configuring not-yet-mapped windows that just had its zero sized dimension pass through the constraint machinery, resulting in a 1x1 sized window. If we'd properly set up the min size metadata earlier, that 1x1 would likely be the minimum size set of a window, which makes things harder to predict when peeking at side effects. However, what the side effect peeking intends to do, as documented in the comment, was to figure out when the client hadn't committed any buffer yet, i.e. during the initial map, and in those cases avoid sending that nasty 1x1 size, resulting in silly window sizes. A more robust way to detect this is instead checking when we shouldn't really try resize things our own way, and in those cases early out as was done before. This means that, for a yet to me mapped window, we only ever want to send an initial non-zero configuration when 1) it's initially maximized, 2) initially fullscreen, or 3) initially tiled in any way, as those are the situations where the compositor is the one deciding the size. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1912>
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.
It can be useful to look at the documentation available at the Wiki.
Coding style and conventions
See HACKING.md.
Git messages
Commit messages should follow the GNOME commit message
guidelines. We require an URL
to either an issue or a merge request in each commit. Try to always prefix
commit subjects with a relevant topic, such as compositor: or
clutter/actor:, and it's always better to write too much in the commit
message body than too little.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.