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Fixes terminal emulator misbehaviour as outlined in https://gitlab.gnome.org/GNOME/gtk/issues/1316, which was introduced in 49b17e6c. The original commit cleared preedit text by setting it to an empty string, which still counted as existing preedit. The fix sets preedit string to null, which is correctly understood as not present.

This was broken when I recently introduced this helper
function.

GtkApplication: Fix CRITICAL on shutdown when register_session=FALSE

See merge request GNOME/gtk!320

ci: Add an optional Windows build job using autotools and MSYS2

See merge request GNOME/gtk!319

Set to "manual" because it takes 40-60 minutes depending on the ccache hit rate.

A number of applications want to track the state of the screensaver.
Make this information available as a boolean property. We only listen
for state changes when ::register-session is set to TRUE.

This is implemented for unsandboxed D-Bus access by talking
directly to org.gnome.ScreenSaver or org.freedesktop.ScreenSaver,
and for sandboxed D-Bus by using a (new) portal API.
A Quartz implementation is missing.

When the environment variable is set, don't connect
to the session manager, but instead rely on the
inhibit portal.

Less code duplication, more sticky toffee!

Less code duplication, more cookies!

Less code duplication, more cake!

The paths that we create for requests and sessions
need some icky code to create. Keep it in one place.