[gtk] (11 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:

  2765ced... shortcuts: Use GTK_DEBUG_KEYBINDINGS
  0cfa3d1... Drop GTK_DEBUG_SHORTCUTS
  d2df8b6... wayland: Respect GDK_DEBUG=default-settings
  6a7580e... testsuite: Don't pass GDK_DEBUG for release builds
  581192f... gdk: Better help for GDK_DEBUG
  b53ea88... gsk: Better help for GSK_DEBUG
  35111ed... gtk: Better help for GTK_DEBUG
  407c362... widget: Avoid uninitialized access
  6fdf6d5... Add g_intern_static_string to valgrind suppressions
  d2937c9... Stop setting GTK_IM_MODULE_FILE

Commits added to the branch:

  6819c7c... docs: Update environment sections
  4fa71fd... shortcuts: Use GTK_DEBUG_KEYBINDINGS
  30eca5a... Drop GTK_DEBUG_SHORTCUTS
  d46b046... wayland: Respect GDK_DEBUG=default-settings
  d31bb8b... testsuite: Don't pass GDK_DEBUG for release builds
  9f2926d... gdk: Better help for GDK_DEBUG
  93a51f7... gsk: Better help for GSK_DEBUG
  a6752bd... gtk: Better help for GTK_DEBUG
  5229069... widget: Avoid uninitialized access
  1f8c79e... Add g_intern_static_string to valgrind suppressions
  01fbf84... Stop setting GTK_IM_MODULE_FILE