Merge pull request #7371 from m-kuhn/backport_7354

Handle invalid step size

Author: m-kuhn

src/gui/editorwidgets/qgsrangewidgetwrapper.cpp

@@ -138,7 +138,7 @@ void QgsRangeWidgetWrapper::initWidget( QWidget *editor )
     int minval = min.toInt();
     if ( allowNull )
     {
-      int stepval = step.toInt();
+      int stepval = step.isValid() ? step.toInt() : 1;
       minval -= stepval;
       mIntSpinBox->setValue( minval );
       mIntSpinBox->setSpecialValueText( QgsApplication::nullRepresentation() );

tests/src/python/test_provider_postgres.py

@@ -479,7 +479,7 @@ def testTransactionConstrains(self):
 
         # check new values
         self.assertTrue(vl.getFeatures('id=1').nextFeature(f))
-        self.assertEqual(f.attributes(), [1, 1, NULL])
+        self.assertEqual(f.attributes(), [1, 1, 0])
 
     def testTransactionTuple(self):
         # create a vector layer based on postgres