completion should not inherit read-only property

[T. V. Raman]

I've noticed that recently, completion has started inheriting the
read-only property.

Test: if you have a string in a read-only buffer
e.g. foobarbasbar 

and you then type foo and complete it to foobarbasbar  using
command `complete' then the completed string ends up read-only. 

This is an irritant because if this happens to you in a mail
composition buffer (I use vm) then sending mail fails because
part of the buffer is read-only --- you end up having to eval
the appropriate lisp expression to remove the read-only property
with something like:
(let ((inhibit-read-only t))
    (put-text-property start end
                       'read-only nil))

-- 
Best Regards,
--raman

      
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