Summary:
The screenlock fails on X11 if it can't grab the keyboard.
We can't nicely solve the generic case. We can solve the common case of
a kwin effect being active.
It's not critical, arguably not even desirable to have these effects
persist after the screen is locked through an external trigger. We can
just close the effect early.
Key grabs have to be relased early before the close animation completes
so that the locker doesn't have a race based on animation times.
It's not ideal, but no worse than the current state for not much work.
BUG: 234153
Test Plan:
locked screen on a timer
opened various effects
Reviewers: #kwin, zzag
Reviewed By: #kwin, zzag
Subscribers: ngraham, zzag, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D20890
If we try to query before WaylandServer created the KSldApp the service
owner change is never delivered. Thus a delay till we know that the
service is there on Wayland. On X11 the initialization can be done
directly.
To know when the WaylandServer is fully initialized an additional
signal is added to WaylandServer.
It's created together with input, so that the input mechanismn already
has a way to check whether screen is locked.
Effects doesn't hold a member variable any more and instead uses the
singleton instance.
Being able to monitor whether the screen is locked is useful not only
to the effects system but overall in KWin. Thus to make it possible to
use it from more locations as a first step it's moved into dedicated
source files.
