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Carlos Garnacho 5671f0a284 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
2020-04-21 21:32:53 +00:00
.gitlab/issue_templates gitlab: Add missing < in markdown comment tag 2020-02-14 03:10:28 +00:00
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clutter compositor: Add support for direct scanout of Wayland surfaces 2020-04-16 15:05:52 +02:00
cogl clutter/view: Make it possible to assign a temporary direct scanout 2020-04-16 15:05:52 +02:00
data display: Make check-alive timeout configureable 2020-02-23 17:28:57 +00:00
doc Add MetaGravity and replace X11 equivalent with it 2020-02-29 21:01:50 +00:00
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src x11: Allow X11 clients to clear the selection 2020-04-21 21:32:53 +00:00
tools tools: Remove obsolete ppa-magic.py 2018-11-30 11:12:12 +08:00
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NEWS Revert "Bump version to 3.36.1" 2020-03-30 21:44:55 +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.