942883577e
When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886 |
||
|---|---|---|
| .gitlab-ci | ||
| clutter | ||
| cogl | ||
| data | ||
| doc | ||
| meson | ||
| po | ||
| src | ||
| tools | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| config.h.meson | ||
| COPYING | ||
| meson_options.txt | ||
| meson.build | ||
| mutter.doap | ||
| NEWS | ||
| README.md | ||
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.