[gtk] (7 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:

  1b9d433... bitset: Cosmetic documentation changes
  7d4d78b... shortcuts: Use GTK_DEBUG_KEYBINDINGS
  fb52b4e... Drop GTK_DEBUG_SHORTCUTS
  51a402f... gdk: Better help for GDK_DEBUG
  912ca96... gsk: Better help for GSK_DEBUG
  a6a5aa1... gtk: Better help for GTK_DEBUG

Commits added to the branch:

  cf17ebb... bitset: Cosmetic documentation changes
  38b9e09... stack: Cosmetic documentation fixes
  d863e83... shortcuts: Use GTK_DEBUG_KEYBINDINGS
  34e0fea... Drop GTK_DEBUG_SHORTCUTS
  3a3bb1c... gdk: Better help for GDK_DEBUG
  a86e0b4... gsk: Better help for GSK_DEBUG
  64bf128... gtk: Better help for GTK_DEBUG