Commit a35a7fcb5a introduced the usage
of insets to correctly take into account the default Android status bars
and other reserved regions.
However in practice that does not work as expected - the bottom inset
is always reported to be non-zero, even when fullscreen mode is enabled.
To fix the issue, FLAG_FULLSCREEN is explicitly checked before applying
the insets.
Fixes: QTBUG-99624
Pick-to: 6.3 6.2
Change-Id: I8b25f0b06447cd452c42ef072493e3137e25f38b
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>