* Updates from upstream gnome-3-18 branch:

  - Fixes to the icon cache code.
  - Ignoring events outside of frame in get_control.
  - Fix for XError crash in free_win function (LP: #1582687).

git-svn-id: svn://anonscm.debian.org/pkg-gnome/desktop/unstable/metacity@48935 db0db5de-e4c8-0310-9441-90abf70311f7