Only check for validity if attribute has changed

Author: elpaso

src/gui/attributetable/qgsattributetabledelegate.cpp

@@ -94,25 +94,22 @@ void QgsAttributeTableDelegate::setModelData( QWidget *editor, QAbstractItemMode
   if ( !eww )
     return;
 
-  // This fixes https://issues.qgis.org/issues/16492
-  QgsFeatureRequest request( fid );
-  request.setFlags( QgsFeatureRequest::NoGeometry );
-  request.setSubsetOfAttributes( QgsAttributeList( ) );
-  QgsFeature feature;
-  vl->getFeatures( request ).nextFeature( feature );
-  if ( ! feature.isValid( ) )
-  {
-    // Model is out of sync (again!).
-    return;
-  }
-
   newValue = eww->value();
 
   if (( oldValue != newValue && newValue.isValid() ) || oldValue.isNull() != newValue.isNull() )
   {
-    vl->beginEditCommand( tr( "Attribute changed" ) );
-    vl->changeAttributeValue( fid, fieldIdx, newValue, oldValue );
-    vl->endEditCommand();
+    // This fixes https://issues.qgis.org/issues/16492
+    QgsFeatureRequest request( fid );
+    request.setFlags( QgsFeatureRequest::NoGeometry );
+    request.setSubsetOfAttributes( QgsAttributeList( ) );
+    QgsFeature feature;
+    vl->getFeatures( request ).nextFeature( feature );
+    if ( feature.isValid( ) )
+    {
+      vl->beginEditCommand( tr( "Attribute changed" ) );
+      vl->changeAttributeValue( fid, fieldIdx, newValue, oldValue );
+      vl->endEditCommand();
+    }
   }
 }