Add deprecated support for wl_scaler

[ChangeLog][Compositor] Add deprecated support for the deprecated wl_scaler.

Some clients are stuck on the unofficial Weston protocol wl_scaler instead of
the standardized and stable wp_viewporter. This implements optional support for
wl_scaler.

This patch has been written to be easily removable in Qt 6, and touches a
minimal amount of other code.

The implementation can be tested using the new manual test compositor:
tests/manual/wlscaler.

Weston 1.11.1 has a demo client named weston-resizor, which can be used to
test. Note that although newer versions of Weston also have weston-resizor,
those versions use wp_viewporter instead of wl_scaler, so you really need
1.11.1 or earlier to test.

Fixes: QTBUG-69635
Change-Id: Id572e28044cd764eaf63b1259a92bc589711c39d
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

0 files changed, 0 insertions, 0 deletions