This report applies to trunk r9671.

A tight formation of artillery tanks is rather effective.  Unfortunately, when the units are so close to each other, the health bars of northern units disappear behind the southern units, so it isn't easy to know which units have suffered dangerous levels of damage.  A pane at the right shows health bars for selected units but not for all of them if too many are selected.

It would be handy if the health bars were drawn at the top of the z-order, in front of all units.  This could be configurable as a user preference in case some players like the current behaviour.