[gtk] (7 commits) Non-fast-forward update to branch wip/baedert/gl-rework

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/gl-rework' 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:

  1fa2ae5... GskTransform: Compute sin/deg of 90deg rotations manually
  d3d65f1... testsuite: Add a test case for rotated border node
  b83eebe... gl renderer: Avoid copying a matrix
  bbfede4... gl renderer: Move work to the blur vertex shader
  5771e49... gl renderer: transform border outline like everything else
  ce06a56... gl renderer: Trivial variable reordering

Commits added to the branch:

  5cfe227... GskTransform: Compute sin/deg of 90deg rotations manually
  6ff06ff... testsuite: Add a test case for rotated border node
  fe7fac7... gl renderer: Avoid copying a matrix
  28a9574... gl renderer: Move work to the blur vertex shader
  67216d3... gl renderer: transform border outline like everything else
  71188e1... gl renderer: Trivial variable reordering
  61dad3b... gl renderer: Add debug code for color nodes