[gtk] (9 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:

  1e2118a... gl renderer: Don't copy matrix/offset of color matrix nodes
  298c7ea... gl renderer: Remove unused translation handling
  b7b2067... gl renderer: Remove a few outdated comments
  8f6f465... gl renderer: Trivial declaration reorder
  1d3a24a... gl renderer: Mark beginning of frame if DEBUG_OPS is set
  8461f6c... GdkGLContext: check for GL_KHR_debug for GL debug output
  93e6d19... gltextureatlas: Use more correct debug name for texture
  bf297f6... gl renderer: Upload GL_RGBA texture data in GLES

Commits added to the branch:

  e2a9887... gl renderer: Don't copy matrix/offset of color matrix nodes
  660a073... gl renderer: Remove unused translation handling
  dba3a09... gl renderer: Remove a few outdated comments
  f1661b3... gl renderer: Trivial declaration reorder
  1dacfbc... gl renderer: Mark beginning of frame if DEBUG_OPS is set
  ba15eb8... GdkGLContext: check for GL_KHR_debug for GL debug output
  b4a01fe... gltextureatlas: Use more correct debug name for texture
  a2e4401... gl renderer: Upload GL_RGBA texture data in GLES
  53dd853... widget-factory: Fix more builder tool fallout