Nyall Dawson 22f1a1dee7 Implement QgsEditorWidgetWrapper::showIndeterminateState() for setting
editor widgets into an indeterminant "unknown value" state

Works for all editor widgets except date time, range and uuid widgets.
2016-04-05 13:06:25 +10:00
..
2015-08-30 13:00:15 +02:00