Do not clear property selection when adding new properties, but instead correct positions of any open editor controls.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63356 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/propgridpagestate.cpp

@@ -1671,10 +1671,6 @@ bool wxPropertyGridPageState::PrepareToAddItem( wxPGProperty* property,
     }
 #endif // wxDEBUG_LEVEL
 
-    // Make sure nothing is selected.
-    if ( propGrid )
-        propGrid->ClearSelection(false);
-
     // NULL parent == root parent
     if ( !scheduledParent )
         scheduledParent = DoGetRoot();