[gtk] (13 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  19d760f... gtk-demo: Fix a typo (*)
  279d3c0... gtk-demo: Rename the transition shader files (*)
  cef1cd1... gsk: Avoid long lines in serialized nodes (*)
  5640208... node-editor: Don't insert hyphens (*)
  ff7bcf7... colorbutton: Properly override interface properties (*)
  9fdb71c... icontheme: Add a missing getter (*)
  38bd443... directorylist: Drop the item-type property (*)
  1b1bf6c... text: Add some missing setters and getters (*)
  9d0d4ce... Cosmetics (*)
  60b1b46... spinbutton: Add some missing accessors (*)
  d0b7a4a... testsuite: Add a test that checks for property accessors (*)
  ac79c0e... textbuffer: Improve some get_iter apis (*)
  6e594da... Merge branch 'matthiasc/for-master' into 'master'

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