b3e19ee669
On a successful DnD operation we may expect the wl_data_source and wl_data_offer to live long enough to finish the data transfer, despite the grab operation (and other supporting data) being gone. When that happens, the compositor expects a wl_data_offer.finish request to notify that it finished. However the client may still chose not to send that and destroy the wl_data_offer instead, resulting in the MetaSelectionSource owner for the DnD selection not being unset. When that happens, the DnD MetaSelectionSource still exists but it's detached from any grab operation, so will not be unset if eg. the drag source client destroys the wl_data_source. This may result in crashes when the next drag operation tries to replace the owner DnD MetaSelectionSource. Check explicitly for this case, in order to ensure the DnD owner is unset after such operations. Closes: https://gitlab.gnome.org/GNOME/mutter/issues/591
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.