Include file:
Partial attempt to change the appearance or location of the
panner buttons on a drawing editor. Perhaps there is a unremembered bugfix
in this subtree (which includes OvLeftMover, OvRightMover, OvUpMover, and
OvDownMover) but an inspection of the methods doesn't show one up. These
classes could be factored out in the future, or used to improve the appearance
and feel of the panner buttons in drawing editors other than idraw.