I'm using fold a lot and wondering if there is a way to yank ONLY the
displayed texts?
that is , say I have following folding:

     30 hostname "WASHDC core"
     31 +-- 34 lines: aaa new-model
     65 +--  2 lines: !
     67 service password-encryption
     68 baseline show-delta-counts
     69 !
     70 +--  3 lines: controller sonet 12/0
     73 !
     74 +--  3 lines: controller sonet 13/0
     77 !
     78 +-- 23 lines: controller sonet 4/0
    101 +-- 31 lines: !

normally when you yank a folded line, it actually yank the whole texts
that line folded, not only the displayed title.
but I want to also have the option to do the other way -- just yank the
texts that is getting displayed.

this is kind of another good usage of folding -- generate an overview
that can be passed to other places.

regards
ping