[gtk/matthiasc/for-master] (9 commits) ...css: Fix the initial values optimization

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  66af531... display-x11: don't mention gdk_monitor_is_primary in the do (*)
  e7f2833... Merge branch 'wip/muktupavels/update-documentation' into 'm (*)
  4ab12ab... Remove last GtkWidgetPath reference (*)
  0a8d760... icon-cache: Add new function to list all the icons in a dir (*)
  e417066... IconTheme: Make icon lookups faster (*)
  308d434... GtkIconCache: Remove unused code (*)
  046de4c... icon-theme: Only have one copy of the icon flags enum (*)
  4685fe1... Merge branch 'faster-theme-lookup' into 'master' (*)
  b8ffe5b... css: Fix the initial values optimization

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