[gtk+] (6 commits) Non-fast-forward update to branch wip/attachment

[William Hua <williamhua src gnome org>]

The branch 'wip/attachment' 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:

  f03ce00... gdkwindow: add attachment data structures
  462a0ed... gdkwindow: add gdk_window_set_attachment_parameters ()
  296e85c... gtkmenu: add gtk_menu_popup_with_parameters ()

Commits added to the branch:

  ca22e22... gdkwindow: add attachment data structures
  f1c02dc... gdkwindow: add gdk_window_set_attachment_parameters ()
  e33a09f... gtkmenu: add gtk_menu_popup_with_parameters ()
  8bde4b8... gtkmenuitem: use gtk_menu_popup_with_parameters ()
  8062a98... gtkmenuitem: remove gtk_menu_item_position_menu ()
  7bb6507... x11: implement set_attachment_rectangle ()