
At the moment, gr-diff-highlight react to selection change event, so if there are multiple instances on the page, for example in gr-change-view, all instances react to selection. This change makes gr-diff-highlight to ignore selections for other instances, thus reacting only its own selection. Bug: Issue 5504 Change-Id: I9f0e1dc7fe9f316400d9c96fb0c8c5f7ff78d779