Make sure all the proper arguments are applied when bringing a git
diff/show/blame editor to the foreground.

Task-number: QTCREATORBUG-5176
Change-Id: I4ca603311335ac4e591ba38a690f1f3a27725e8f
Reviewed-on: http://codereview.qt-project.org/5157


Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>