QNX: Fixed changed XML content not being saved

The problem occurred when changing the XML source code
in the source editor, and not switching to any of the
widget views before saving.

Change-Id: I6831f54d8cb4b94dbc02aa3c305c2e9839f1c64c
Reviewed-by: Mehdi Fekari <mfekari@rim.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>