[gtk] (8 commits) Non-fast-forward update to branch wip/otte/transform

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/transform' 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:

  148af95... testsuite: Add a transforms test
  db48427... widget: Make transform a GskTransform
  ce6fde5... transform: Remove gsk_transform_identity()
  fd91cf9... transform: Implement gsk_transform_invert()
  564506e... transform: Store the category in the transform
  edc0bc2... transform: Redo querying API
  24cc50c... transform: Readd optimization
  315a0d1... rendernode: Implement diffing of transform nodes

Commits added to the branch:

  979e9be... testsuite: Add a transforms test
  b391aea... widget: Make transform a GskTransform
  70b3411... transform: Remove gsk_transform_identity()
  3545abc... transform: Implement gsk_transform_invert()
  1fecbd4... transform: Store the category in the transform
  bd113aa... transform: Redo querying API
  a8bf5ee... transform: Readd optimization
  dbe5845... rendernode: Implement diffing of transform nodes