Suppress sending spurious wxEVT_PG_SELECTED events.

Don't send wxEVT_PG_SELECTED event when wxPG is ordered to unselect current property but no property is actually selected.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78519 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/propgrid.cpp

@@ -4378,8 +4378,12 @@ bool wxPropertyGrid::DoSelectProperty( wxPGProperty* p, unsigned int flags )
     // call wx event handler (here so that it also occurs on deselection)
     // In case of deselection previously selected property
     // is passed to the event object.
-    if ( !(flags & wxPG_SEL_DONT_SEND_EVENT) )
-        SendEvent( wxEVT_PG_SELECTED, p? p: prevFirstSel, NULL );
+    if (!p)
+    {
+        p = prevFirstSel;
+    }
+    if ( !(flags & wxPG_SEL_DONT_SEND_EVENT) && p)
+        SendEvent( wxEVT_PG_SELECTED, p, NULL );
 
     return true;
 }