[gtk/matthiasc/for-master] (9 commits) ...gtk-demo: Fix the stack demo

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  7e02660... Merge branch 'matthiasc/for-master' into 'master' (*)
  bc2c341... gtk-demo: Visual fixes to the model button demo
  ba25e08... menubutton: Add a use-underline property
  163aa82... gtk-demo: Use mnemonics in menu buttons
  059917b... gtk-demo: Fix the overlay demo
  fbed55d... gtk-demo: Fix the rotated text demo
  48910a6... gtk-demo: Fix the shortcuts demo
  e2c327e... gtk-demo: Fix the sliding puzzle
  f3d061e... gtk-demo: Fix the stack demo

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