[gtk] (10 commits) Non-fast-forward update to branch x11-props

[Matthias Clasen <matthiasc src gnome org>]

The branch 'x11-props' 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:

  0efa684... tests: Stop sticking windows
  848ab08... window: Drop sticky
  b18882f... Drop GdkToplevel:sticky
  e6ca875... tests: Stop using keep above/below
  f5bd709... window: Drop keep above/below
  ea06f5d... Drop GdkToplevel:keep-above/below
  67ece37... Drop focus-related properties
  61fcc2c... Drop GdkToplevel:accept-focus/:focus-on-map

Commits added to the branch:

  dfda880... window: Drop gtk_window_set_attached_to (*)
  951f821... Merge branch 'window-attach' into 'master' (*)
  d4f49a8... tests: Stop sticking windows
  fb7ef8f... window: Drop sticky
  ef0c85e... Drop GdkToplevel:sticky
  dabbc67... tests: Stop using keep above/below
  b6c9a8e... window: Drop keep above/below
  5e8b877... Drop GdkToplevel:keep-above/below
  b3716bd... Drop focus-related properties
  a6e65d7... Drop GdkToplevel:accept-focus/:focus-on-map

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