[gtk] (3 commits) Non-fast-forward update to branch matthiasc/for-main

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-main' 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:

  936c9c8... gtk4-demo: Restructure the font features demo
  1632541... gtk4-demo: Polish the font features demo
  45bf577... gtk3-demo: Add animation to font features

Commits added to the branch:

  3d2309a... gtk4-demo: Restructure the font features demo
  8c1aa3b... gtk4-demo: Polish the font features demo
  4420b85... gtk3-demo: Add animation to font features