[gtk] (6 commits) Non-fast-forward update to branch color-glyph-fixes

[Matthias Clasen <matthiasc src gnome org>]

The branch 'color-glyph-fixes' 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:

  1f99d94... gsk: Make color glyphs
  b21f172... ngl: Use per-glyph color information
  ac86e1d... gsk: Cache per-glyph color information
  6cdb46f... gsk: Use harfbuzz for color fonts
  ab7f92a... Bump the harfbuzz dep

Commits added to the branch:

  dc745be... testcase
  25ee333... gsk: Mark color glyphs
  17560b4... ngl: Use per-glyph color information
  2bb45b7... gsk: Cache per-glyph color information
  a18fbd5... gsk: Use harfbuzz for color fonts
  0ca20c7... Bump the harfbuzz dep