Calling StringWidget.setContents with unchanged multiline caused infinite loop
Calling StringWidget.setContents with unchanged multiline caused infinite loop

gui/modules/constant_configuration.py:
- StringWidget.setContents:
  We should call updateContents on self._widget, not on self

Bugfix: Infinite loop when changing string in Mashup App

Nikea/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,minesense/VisTrails,minesense/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,minesense/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,celiafish/VisTrails,minesense/VisTrails,Nikea/VisTrails,hjanime/VisTrails,celiafish/VisTrails,hjanime/VisTrails,celiafish/VisTrails,celiafish/VisTrails,minesense/VisTrails,Nikea/VisTrails