If point suppression is disabled, enable it.
Else, if a display form is actually being point-suppressed, suppress that display form throughout this window. (this is just so the user doesn't have to disable point suppression to get at the point-suppressed display form.)
Else just suppress this display form throughout this window.
doc for display suppression IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html