🚀 go-pugleaf

version: Epoch 4.2

It is impossible to hide the body of any entry in outline mode which
contains ANY read only zones.

The problem is that subst-char-in-region gives an error if the region
passed to it contains ANY read only zones, even if these zones would
not be modified by the operation.

Here is a function which demonstrates this behaviour:

(defun demonstrate-subst-bug ()
  (let ((start (point)))
    (insert "Sample text.")
    (add-read-only-zone (+ 1 start) (+ 3 start)  nil nil)
    (subst-char-in-region 454 464 ?x ?w t)
    )
  )

I believe that an operation on a region should only signal an error if
the operation would actually alter a read only zone.

It would be nicer still if read only zones could be temporarily
overridden, much in the same spirit as the last argument to
subst-char-in-region.

Comments?  Opinions?  For the moment, I'll just leave read only zones
out of my buffers.
--
La Monte H. Yarroll	Home:		piggy@baqaqi.chi.il.us
   Work:		piggy@hilbert.maths.utas.edu.au
   AKA:			piggy@gargoyle.uchicago.edu
   Once upon a time:	postmaster@clout.chi.il.us