margin_width() -- controls margins around tooltip's text
margin_height() -- controls margins above and below tooltip's text
wrap_width() -- controls maximum width of text before wordwrapping is enforced
These are read-only for the current release,
and read/write as an ABI feature.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9510 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
