GNU bug report logs - #16818
Undo in region after markers in undo history relocated

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Message #41 received at 16818 <at> debbugs.gnu.org (full text, mbox):

From: Barry OReilly <gundaetiapo <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 16818 <at> debbugs.gnu.org
Subject: Re: bug#16818: Acknowledgement (Undo in region after markers in undo
 history relocated)
Date: Thu, 13 Mar 2014 12:55:57 -0400

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> Oh, I think I see: with the current code, the mark-ring gets copies of
> markers and those copies are made "late", so if you do "C-SPC, some
> deletion around point, and then C-SPC", a new marker for the first C-SPC
> is pushed on the mark-ring, but the undo-log has an adjustment for
> mark-marker rather than for that new marker.

> IOW, I think the primitive-undo fix is needed and your fix is also
> needed.

Yes that's right. Parents cover their childrens' eyes at the violence
of our agreement.

I just discovered my patch has a bug. If I C-SPC first thing after
starting Emacs, an error is signaled because the mark is nil. I had
hoped the mark variable initialized equivalently except to make itself
available to Lisp. There are clearly holes in my understanding of the
initialization business. I'll debug that at a later time.

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