When delivering shortcut events, make it possible
for the current active focus item to override the focus.

The use case is having an edit/copy menu (ctrl+c) and
a text edit. When the text edit is focused, it should
override the global shortcut.

Change-Id: Ide5b94832289c32762ef7304cdc94c107301d579
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>