[gtk+] (15 commits) Non-fast-forward update to branch wip/baedert/gl

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/gl' 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:

  d538781... gl renderer: Rework once more
  d740e9d... gsk: Move all gskgl* files into gl/
  b1c45f5... gl renderer: Move render ops into separate file
  b804b9b... gl renderer: Implement cairo nodes again
  8a83f52... gl renderer: Only check for color glyphs once per text node
  0ae6b68... gl renderer: Stop collecting VAOs in clear_tree
  d09eff9... gl renderer: Remove unused VAO
  cbf395a... gl renderer: Optimize text drawing
  dddd46a... gl ops: Remove dead code
  c8b96db... gl renderer: Factor out a helper function for offscreen dra
  e9ad92f... gl render ops: Rename a member
  b7a67e3... gl renderer: Implement color matrix nodes again
  fa5b7c2... gl renderer: Don't draw texture nodes to a framebuffer
  4e11fe3... gl renderer: Keep track of current program color value
  228154f... widgetbowl: Only use one widget type

Commits added to the branch:

  a9ca586... gl renderer: Rework once more
  a0004e1... gsk: Move all gskgl* files into gl/
  284a478... gl renderer: Move render ops into separate file
  00fcad4... gl renderer: Implement cairo nodes again
  942d20b... gl renderer: Only check for color glyphs once per text node
  cae9690... gl renderer: Stop collecting VAOs in clear_tree
  b48eed0... gl renderer: Remove unused VAO
  863c23d... gl renderer: Optimize text drawing
  313c318... gl ops: Remove dead code
  f30dab7... gl renderer: Factor out a helper function for offscreen dra
  4fa1506... gl render ops: Rename a member
  35cd387... gl renderer: Implement color matrix nodes again
  76f700f... gl renderer: Don't draw texture nodes to a framebuffer
  4da2a61... gl renderer: Keep track of current program color value
  b551195... widgetbowl: Only use one widget type