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bug#2553: *vc-diff* buffers are read-only, but M-k works

From: Juanma Barranquero
Subject: bug#2553: *vc-diff* buffers are read-only, but M-k works
Date: Wed, 4 Mar 2009 16:54:46 +0100

On Wed, Mar 4, 2009 at 16:41, Chong Yidong <address@hidden> wrote:

> However, it's counter-intuitive that undo does not work.
> Probably the easiest fix is to define a diff-undo command that lifts the
> read-only restriction temporarily.  Any thoughts?

Most operations on diff-mode buffers do not change the buffer or are
easily reversible (diff-reverse-direction, diff-unified->context,
etc.). Making the buffer read-write is a C-x C-q away, if the user
needs to use undo or normal editing commands.

What is a bit of a pain is that the user cannot easily setup vc-diff
to default to a read-write buffer, because there's no vc-diff-hook and
`(setq buffer-read-only t)' is done after calling diff-mode, so
diff-mode-hook isn't useful either. The only way right now (other than
modifying the source) is to advise vc-diff.

My 0.02€


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