[gtksourceview] (3 commits) Non-fast-forward update to branch wip/gtk-buildable

[Sébastien Wilmet <swilmet src gnome org>]

The branch 'wip/gtk-buildable' 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:

  6939623... view: implement GtkBuildable::get_internal_child() for "com
  aff726e... completion: implement GtkBuildable::get_internal_child()
  1c9f196... completion: center the label in the info window

Commits added to the branch:

  4c1a04b... Updated Polish translation (*)
  03f82af... view: implement GtkBuildable::get_internal_child() for "com
  ad4e51a... completion: implement GtkBuildable::get_internal_child()

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