[gtk] (16 commits) Created branch matthiasc/for-master-2

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master-2' was created.

Summary of new commits:

  ed742f1... testperf: Allow measuring start time
  b7b2510... testperf: More flexible mark selection
  85ad943... placessidebar: Change some initial property values
  1e6171a... Read bookmarks async
  ed6c0dc... Don't export color picker functions
  005ea7a... entry: Avoid criticals in dispose
  47c21a2... textview: Don't update action state in dispose
  b1d5de7... notebook: Don't trigger criticals in dispose
  955305a... treestore: Silence compiler warnings
  2379278... gdk: Silence some compiler warnings
  a1f4fbd... frameclock: cosmetics
  c0282ab... icontheme: Remove some dead code
  f66f62f... Add a lib64 variant of gtk.supp
  c503c8c... widget: Fix a memory leak with class actions
  5541894... icontheme: Fix various memory leaks
  d812122... emojichooser: Add profiler marks for loading