[gtk] (6 commits) Non-fast-forward update to branch subpixel-positioning

[Matthias Clasen <matthiasc src gnome org>]

The branch 'subpixel-positioning' 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:

  2c82280... Turn off metrics hinting
  fba9e14... vulkan: implement subpixel positioning
  a3dda04... gl: implement subpixel positioning
  edf6b3b... reftest: Exclude flaky tests

Commits added to the branch:

  8752564... Remove new attributes from tests (*)
  7eb5dfd... inspector: Show the pango backend (*)
  4de670b... Turn off metrics hinting
  5c9643b... vulkan: implement subpixel positioning
  5dd8801... gl: implement subpixel positioning
  032473f... reftest: Exclude flaky tests

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