added region invalidation to cause repainting of areas previously occupied by a removed line git-svn-id: svn://10.0.0.236/trunk@117493 18797224-902f-48f8-a5cc-f745e15eee43
added region invalidation to cause repainting of areas previously occupied by a removed line git-svn-id: svn://10.0.0.236/trunk@117493 18797224-902f-48f8-a5cc-f745e15eee43