GNU bug report logs - #8219
23.3; Crash in indirect buffer

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Message #25 received at 8219 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Chong Yidong <cyd <at> stupidchicken.com>, 8219 <at> debbugs.gnu.org,
	emacs-devel <at> gnu.org
Subject: Re: Effect of deletions on indirect buffers (Bug#8219)
Date: Fri, 11 Mar 2011 18:19:25 -0500

> This makes a lot of sense, but your description seems to point out
> that the implementation does not behave according to the docs: if
> markers are (or should be) relocated in sync as result of insertion
> and deletion, the same should happen with PT, BUF_BEGV, etc.

Actually, indirect buffers keep their point and narrowing in real
markers.  So when they get "active" the BUF_PT, BUF_ZV, etc... get
updated, but until that time, BUF_PT and friends may hold invalid data.
I.e. any place where we use BUF_PT on something else than
current_buffer, we have a bug waiting to happen unless we know for sure
that that buffer is not indirect.


        Stefan

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