Moved property unattachment code from wxPropertyGridInterface::RemoveProperty() to wxPropertyGridPageState::DoDelete() - fixes deferred removal issue

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63624 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/propgridpagestate.cpp

@@ -1979,6 +1979,10 @@ void wxPropertyGridPageState::DoDelete( wxPGProperty* item, bool doDelete )
     if ( pg && pg->m_propHover == item )
         pg->m_propHover = NULL;
 
+    // Mark the property as 'unattached'
+    item->m_parentState = NULL;
+    item->m_parent = NULL;
+
     // We can actually delete it now
     if ( doDelete )
         delete item;