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Artur Grunau authored
If a DataNamePropertyWidget is created for a DataNameProperty whose AccessInfo == READ, it doesn't instantiate a QLineEdit to display the property's value (QComboBox is used instead). Previously, the updateWidgetFromProperty method didn't check AccessInfo to see what display widget was in use, and simply always dereferenced the _lineEdit pointer. If AccessInfo == READ, it was null and the application crashed. Now updateWidgetFromProperty accesses only the combo box if AccessInfo == READ, and uses the line edit otherwise. Fixes #99
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