[gtk] (12 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:

  829b3ab... Add a selection model test
  6997879... gtk-demo: Add more scrolling benchmarks
  485bbdd... printbackend: Use a list store
  ae115f5... printbackend: Add a list model getter
  9025132... printer: Fix the default value of icon-name

Commits added to the branch:

  e23baa5... inspector: Add columns to the object tree (*)
  0470078... inspector: Use a column view for properties (*)
  42d26b4... inspector: Use a column view for the resource list (*)
  23bc38e... inspector: Make the resource list sortable (*)
  0d9873d... inspector: Use a column view for actions (*)
  2a9d2cc... inspector: Touch up list styling (*)
  9335388... Merge branch 'columnview-1' into 'master' (*)
  4637b8d... selection: Emit ::selection-changed for autoselection
  e542169... gtk-demo: Add more scrolling benchmarks
  89e0bde... printbackend: Use a list store
  470df83... printbackend: Add a list model getter
  bd04fd2... printer: Fix the default value of icon-name

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