It's sufficient (and actually better) to configure the plain
text editor at the moment in which the xml is synchronized.

Task-number: QTCREATORBUG-5251
Change-Id: Ib2a3e1828f61770871486b8fbc1618abda1a5a74
Reviewed-on: http://codereview.qt.nokia.com/931


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
(cherry picked from commit 754b8b3a)