Viktar Donich b8f4484815 Ignore triple clicks for other gr-diff-highlight instances
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
2017-02-08 14:05:31 -08:00
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