[gtk] (16 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  ece9e7e... examples: Drop a redundant frame (*)
  43eeff8... examples: Use existing icons (*)
  d675ae5... bloatpad: Improve accel dialog (*)
  11916ba... bloatpad: Give the toolbar a facelift (*)
  df1116a... bloatpad: Add icons as resources (*)
  7b1a762... print-editor: Make accels work (*)
  424dd8a... actionobserver: Clarify primary_accel_changed docs (*)
  15c6559... action muxer: Propagate accel changes (*)
  db93090... menutrackeritem: Be more careful with accel changes (*)
  d5054f9... action muxer: Propagate registrations further up (*)
  3254a3f... shortcutcontroller: Add a way to update accels (*)
  64af901... window: Propagate accel changes (*)
  7344a03... shortcutcontroller: Don't reinject menu accels (*)
  4d00f19... widget-factory: Show Ctrl-? in the menu (*)
  47bb556... testsuite: Avoid a compiler warning (*)
  1bda665... Merge branch 'matthiasc/for-master' into 'master'

(*) This commit already existed in another branch; no separate mail sent