Add --window argument to :undo.

I don't like using `QApplication.instance()` and then calling methods
that aren't defined for a `QApplication` on it. We need to sort our
module heirarchy out though because there would be an import loop from
importing app here.

1 files changed, 4 insertions, 1 deletions

diff --git a/qutebrowser/app.py b/qutebrowser/app.py
index a1e633ff5..d9fcbfa0d 100644
--- a/qutebrowser/app.py
+++ b/qutebrowser/app.py
@@ -533,8 +533,11 @@ class Application(QApplication):
             tab_stack=window.tabbed_browser._undo_stack,
         ))
 
-    @cmdutils.register(instance='app')
     def undo_last_window_close(self):
+        """Restore the last window to be closed.
+
+        It will have the same tab and undo stack as when it was closed.
+        """
         event = self._undos.pop()
         window = mainwindow.MainWindow(
             private=event.private,