Always call OnSetValue() for a property when values are being set for its children (fixes #12085)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64391 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/property.cpp

@@ -1364,6 +1364,12 @@ void wxPGProperty::SetValue( wxVariant value, wxVariant* pList, int flags )
                 }
                 i++;
             }
+
+            // Always call OnSetValue() for a parent property (do not call it
+            // here if the value is non-null because it will then be called
+            // below)
+            if ( value.IsNull() )
+                OnSetValue();
         }
 
         if ( !value.IsNull() )