Always update position of all visible claim group labels

(bug 53672)
Since there may be more than one claim group label whose vertical position needs to
be updated because more than one claim group label is visible in the viewport, all
those claim group labels' positions are update now, instead of just the first one's
visible in the viewport.

Change-Id: Ie81163471090f217aaed8422b624ffc52eec8b33
Merge "Always update position of all visible claim group labels"