Previously, we accidentally cleared the flag after onMeasure(). This
fixes one cause for the bug where you had to resize the window to see
the content, but the bug still persists in some apps like Shosetsu.
This is needed for the bootstrap job when setting up WhatsApp in
companion device mode.
The implementation is based on `Handler.postDelayed()`, so jobs and
alarms are not persistent for now.
This mode would fullscreen the app behind the semi-transparent status
bars, but such a mode doesn't exist on desktop Linux, so we just use
normal fullscreen.
Some Views block all events going to their descendants, and
then synthesize new events themselves. Gtk doesn't allow event
synthesization, which makes this quite annoying to deal with.
This initial implementation definiely has some problems,
for example it seems to cause infinite loops in some cases,
however it surprisingly works well enough.
This reverts commit b33a470c7b.
This commit was added as fix for layout recreation loops, but this is no
longer a problem, since ViewGroup.detachViewFromParent() has been
improved. The first fix is no longer needed and it seems to cause some
minor regressions, so we revert it.
Some ViewGroups like ViewPager2 call attachViewToParent() without
calling detachViewFromParent() first. This is not allowed according to
the Android API spec, but we need to handle it.
