[gtk] (3 commits) Non-fast-forward update to branch async-highlight

[Matthias Clasen <matthiasc src gnome org>]

The branch 'async-highlight' 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:

  2ac7f2d... gtk-demo: Move the highlighting to a separate file
  8bcc20b... gtk-demo: Do markup parsing incrementally too
  008c1e7... gtk-demo: Fix the Windows build

Commits added to the branch:

  80cddd4... gtk-demo: Move the highlighting to a separate file
  a0cdb54... gtk-demo: Fix the Windows build
  bcc5e47... gtk-demo: Do markup parsing incrementally too