D19731: Have kwin understand that a transformation isn't supported

apol created this revision.
apol added a reviewer: KWin.
Herald added a project: KWin.
Herald added a subscriber: kwin.
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REVISION SUMMARY
  Sometimes the driver will say it is supported but it actually isn't because there's reasons beyond the transformation itself as to whether it's supported.
  This patch modifies the current behavior to remove the new transformation from the supported ones.

TEST PLAN
  Works properly on my tablet

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19731

AFFECTED FILES
  plugins/platforms/drm/drm_object_plane.cpp
  plugins/platforms/drm/drm_object_plane.h
  plugins/platforms/drm/drm_output.cpp

To: apol, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart