51.alpha
========

* Compatibility with kmsconvt
* Add checks to make sure PAM plugins don't drop fsuid privilges and break GDM
* CI improvements
* Reworked the way GDM constructs XDG_DATA_DIRS for its launch environment, so
  that it will no longer hard-code /usr/share at a higher priority than
  /usr/local/share. This behavior would prevent people from locally hacking
  on gnome-shell with --prefix=/usr/local without also having to rebuild GDM
  with the same prefix
* Reworked conflicting session logic to use logind for enumeration. Previously,
  GDM would only look for sessions it started itself, but that would cause it
  to miss conflicting sessions started externally, such as those from ThinLinc
  or TigerVNC
* Fixed bug where plymouth never quit on headless or no-monitor systems, which
  would prevent the system from ever reaching graphical.target
* Added setting to change the fallback session. This is the session that gets
  used whenever a user doesn't have a preferred session selected, or their
  preferred session is unusable. Sysadmins can use this setting to change the
  selected session for users that have never logged into the system before
* Fixed bug where GDM would start X11 sessions with XDG_SESSION_TYPE=wayland
* Fixed PAM handling code to notify PAM modules when we've switched user and
  are about to exec the session leader. This fixes PAM modules like pam_cap.so
  in its `defer` mode
* Removed unnecessary `SetRemoteId` method from the remote display DBus API
* Added setting to turn off local greeter sessions, for headless-only systems
* Removed unused settings
* Documented remote display DBus API
* Documented GDM's settings
* Dropped dconf override of org.gnome.desktop.session.session-name, and instead
  gnome-session is now explicitly told to launch the GDM login screen UI even if
  dconf overrides fail to get applied
* Addressed warnings from Fedora's static analyzer
* Fixed bug where the kernel's VT cursor may flicker during the transition
  between graphical sessions (i.e. at log out)
* Dropped ancient GDM docs, which have been out of date for a very long time and
  are entirely inaccurate now.
* Fixed some more misc. bugs: memory leaks, crashes, etc
* Translation updates

NOTE: In the previous 50.X release series, we removed GDM's ability to execute
the various PreSession/PostSession/etc scripts as part of the X11 removal.
However, it turned out that some people were using these hook points on Wayland,
despite their limited functionality there. Still, the feature is gone for good,
and I wanted to make sure it's listed in the changelog. See the issue for more
details and context: https://gitlab.gnome.org/GNOME/gdm/-/work_items/1059