originally from @aarontam: BHV-743: Compute index bounds for rows whenever metrics are changed.

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
Merge pull request #743 from enyojs/BHV-743-coledavis

originally from @aarontam: BHV-743

Reviewed-By: Cole Davis (cole.davis@lge.com)