358656 Undo stack was used to track pom editor's dirty state

Change-Id: I366985a384f0906936b3b43e1d10dadeb7de66a2
Signed-off-by: Anton Tanasenko <atg.sleepless@gmail.com>
local

Change-Id: Iad0fe6f741c948a3c74f303e00f986dfd7b1ae3e