Use full height on attribute form with drag and drop layout

Author: m-kuhn

src/gui/qgsattributeform.cpp

@@ -666,7 +666,7 @@ QWidget* QgsAttributeForm::createWidgetFromDef( const QgsAttributeEditorElement
 
         ++index;
       }
-      gbLayout->addItem( new QSpacerItem( 0, 0, QSizePolicy::Minimum, QSizePolicy::Expanding ), index, 0 );
+      gbLayout->addItem( new QSpacerItem( 0, 0, QSizePolicy::Minimum, QSizePolicy::Preferred ), index, 0 );
 
       labelText = QString::null;
       labelOnTop = true;