[gtk] (9 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' 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:

  c660378... release script: Include gi-docgen

Commits added to the branch:

  19d9c78... gsk: Make ngl the default OpenGL renderer (*)
  af80f3a... ngl: implement atlas compaction (*)
  0f0ee97... ngl: clear Glyph front cache at the beginning of a frame (*)
  b962a0f... Merge branch 'wip/chergert/fix-ngl-cache-eviction' into 'ma (*)
  8fdedbd... Merge branch 'ngl-by-default' into 'master' (*)
  95a5e7b... release script: Include gi-docgen
  4fce3ce... Cosmetics
  21aa8ae... Cosmetics
  948e032... text tag: Typo fix

(*) This commit already existed in another branch; no separate mail sent