6267732bec
When constructing MetaMonitorsConfig objects, store which type of switch_config they are for (or UNKNOWN if it is not such type of config). Stop unconditionally setting current_switch_config to UNKNOWN when handling monitors changed events. Instead, set it to the switch_config type stored in the MonitorsConfig in the codepath that updates logical state. In addition to being called in the hotplug case along the same code flow that generates monitors changed events, this is also called in the coldplug case where a secondary monitor was connected before mutter was started. When creating the default linear display config, create it as a switch_config so that internal state gets updated to represent linear mode when this config is used. The previous behaviour of unconditionally resetting current_switch_config to UNKNOWN was breaking the internal state machine for display config switching, causing misbehaviour in gnome-shell's switchMonitor UI when using display switch hotkeys. The lack of internal tracking when the displays are already in the default "Join Displays" linear mode was then causing the first display switch hotkey press to do nothing (it would attempt to select "Join Displays" mode, but that was already active). Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/281 https://gitlab.gnome.org/GNOME/mutter/merge_requests/213
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 GNOME Shell, the GNOME core user interface. It can also be run standalone, using the command "mutter", but just running plain mutter is only intended for debugging purposes.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.