Code review: pass 'true' for another visitAll()-_clearCachedData() loop
that follows the same potentially-inefficient pattern. Ian & I can't figure
out when this code would ever be needed - receiving a change event for
something that's not watched is nearly impossible, and it won't have any
cached data to clear anyway. We should probably remove this code in the
future. See https://github.com/adobe/brackets/pull/7155#discussion_r10486221
& follow-on comments for more.