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Carlos Garnacho 025730349d x11: Allow X11 clients to clear the selection
According to the XSetSelectionOwner libX11 documentation:

  [...] If the owner window it has specified in the request is later
  destroyed, the owner of the selection automatically reverts to None,
  but the last-change time is not affected.

This is indeed visible through the selection_timestamp field in
XFixesSelectionNotify events.

Use this to check whether the selection time is recent-ish (thus
likely coming from an explicit XSetSelectionOwner request) and honor
the client intent by setting a "NULL" owner. If the selection time
is too old, it's definitely an indication of the owner client being
closed, the scenario where we do want the clipboard manager to take
over.

This fixes two usecases:
- X11 LibreOffice / WPS clear the selection each time before copying
  its own content. Mutter's clipboard manager would see each of those
  as a hint to take over, competing with the client over selection
  ownership. This would simply no longer happen
- Password managers may want to clear the selection, which would be
  frustrated by our clipboard manager.

There's a slight window of opportunity for the heuristics to fail
though, if a X11 client sets the selection and closes within 50ms, we
would miss the clipboard manager taking over.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1206

(cherry picked from commit 5671f0a284)
2020-04-22 01:27:19 +02:00
.gitlab-ci ci: Fix checking out gnome-shell on stable branches 2019-11-07 00:14:41 +01:00
clutter clutter/brightness-contrast-effect: Compare float with G_APPROX_VALUE 2020-02-02 17:50:30 +01:00
cogl cogl: Fix GLES2 fallback 2020-01-27 17:09:09 +01:00
data wayland: Add setting/api to check the policy to set up the X11 display 2019-08-06 00:41:36 +00:00
doc Remove obsolete .cvsignore files 2019-01-10 11:50:54 -02:00
meson build: Add postinstall script 2019-08-27 09:57:54 +00:00
po Update Chinese (Taiwan) translation 2020-02-19 03:08:50 +00:00
src x11: Allow X11 clients to clear the selection 2020-04-22 01:27:19 +02:00
tools tools: Remove obsolete ppa-magic.py 2018-11-30 11:12:12 +08:00
.gitignore project: Update gitignore 2019-01-10 11:50:54 -02:00
.gitlab-ci.yml ci: Change the without-native-backend to not build with Wayland too 2019-10-10 22:51:00 +00:00
config.h.meson main: Make process PR_SET_DUMPABLE 2019-09-27 14:27:09 +00:00
COPYING Updated obsolete FSF postal address in COPYING 2014-01-12 08:44:30 +07:00
meson_options.txt cogl: Add libsysprof capture based tracing 2019-05-31 11:55:56 -03:00
meson.build Bump version to 3.34.5 2020-03-31 01:17:00 +02:00
mutter.doap Replace Bugzilla by Gitlab URL in DOAP file 2018-12-15 23:50:01 +01:00
NEWS Bump version to 3.34.5 2020-03-31 01:17:00 +02:00
README.md README: Add contribution section 2019-02-14 15:38:46 +01:00

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.