[gtk] (6 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:

  0e4242f... stack: Cosmetic documentation fixes
  b364cec... shortcuts: Use GTK_DEBUG_KEYBINDINGS
  29a0720... Drop GTK_DEBUG_SHORTCUTS
  ee06a2c... gdk: Better help for GDK_DEBUG
  f73c2e8... gsk: Better help for GSK_DEBUG
  bcc8292... gtk: Better help for GTK_DEBUG

Commits added to the branch:

  1ba5885... stack: Cosmetic documentation fixes
  accf9b4... shortcuts: Use GTK_DEBUG_KEYBINDINGS
  ec42fc0... Drop GTK_DEBUG_SHORTCUTS
  c246d61... gdk: Better help for GDK_DEBUG
  fc3af64... gsk: Better help for GSK_DEBUG
  ccfd049... gtk: Better help for GTK_DEBUG