[gtk] (6 commits) Non-fast-forward update to branch wip/baedert/transforms5

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/transforms5' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  8c05c6b... widget: Consider transformation in contains()
  477b7c3... asdf
  16c9c1e... DELETE ME.

Commits added to the branch:

  bd63f53... widget: Don't use compute_bounds in _real_contains
  d5b68b8... widget: Make _translate_coordinatesf public
  abb1f17... widget: Look at transform in compute_bounds
  7d7e7e0... widget: Consider widget transformations in translate_coordi
  2281060... Add picking/translation/compute_bounds unit tests
  a6bceac... Add test for widget transforms