undo problems?

[Miles Bader]

I noticed that undo seems deficient in (at least:) two ways:

  1) Evaporated overlays are not recorded (so cannot be undone)

  2) No care is taken to account for markers with different
     insertion-types (this also obviously affects overlays); for instance,
     if a marker with an insertion-type of 1 is located just *before* some
     deleted text, then only the deletion will be recorded, and undoing it
     will cause the marker to end up *after* the re-inserted text (because
     undo just calls Finsert).

Case (2) seems simple to fix, by calling `record_marker_adjustment' with
a negative argument (corresponding to the size of the deletion) for
markers with insertion-type==1 that are located at the exact beginning
of the deletion.

Can someone confirm my suspicions?

-Miles
-- 
Love is a snowmobile racing across the tundra.  Suddenly it flips over,
pinning you underneath.  At night the ice weasels come.  --Nietzsche