[gtk] (9 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:

  6e245f6... widget-factory: Speed up build
  303d779... gtk-demo: Speed up the build
  952230e... gtk: Speed up build

Commits added to the branch:

  5c3b368... docs: Add note about stable sorting to SortListModel (*)
  a816f81... docs: Fix links in the Getting Started page (*)
  72bbc51... Merge branch 'otte/for-master2' into 'master' (*)
  d7e117f... widget-factory: Speed up build (*)
  200a2f5... gtk-demo: Speed up the build (*)
  802ad39... gtk: Speed up build (*)
  6339875... Fix an oversight (*)
  169effe... Merge branch 'ebassi/getting-started-links' into 'master' (*)
  e9828f1... Fix the build

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