Merged r9782, r9784, r9794 from trunk.
Set human size precision to Rails' default which is now 3 (#11118).
Merged r9781 from trunk.
Merged r9785 from trunk.
CHANGELOG update.
Merged r9783 from trunk.
Merged r9786 from trunk.
Force rendering of activity view if activity items count changed.
Fixed that link to user is escaped in activity title (#11124).