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calc-change-sign and new treatment of minibuffer prompt


From: Roland Winkler
Subject: calc-change-sign and new treatment of minibuffer prompt
Date: Fri, 8 Feb 2002 05:06:24 +0100

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In GNU Emacs 21.1.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-02-01 on tfkp12
configured using `configure  --prefix=/nfs/common --libexecdir=/nfs/common/lib 
--bindir=/nfs/common/lib/emacs/21.1/bin/i686-Linux 
--mandir=/nfs/common/share/man --infodir=/nfs/common/share/info --with-gcc 
--with-pop --with-x --with-x-toolkit=athena i386-pc-linux'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: nil


I am using emacs calc-2.02f. In order to get it work with emacs 21,
I've installed the patch as described in etc/PROBLEMS.

However, there is still a problem with calc-change-sign (usually
bound to `n'.):

Using emacs 20 I could change the sign of a number while I was
typing this number in the minibuffer (just by typing `n'). When I do
the same with emacs 21, point will jump to the beginning of the
prompt and I get the error message "Text is read-only". Then I have
to type `C-g' (keyoard-quit) because somehow the minibuffer is
messed up.

etc/NEWS says:

** The new treatment of the minibuffer prompt might affect code which
operates on the minibuffer.

It seems to me that calc-change-sign is such a function that doesn't
like the new treatment of the minibuffer prompt.

In my emacs sessions minibuffer-prompt-properties's value is (read-only t)


Roland



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