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Re: Edebug corrupting point in buffers.

From: Stefan Monnier
Subject: Re: Edebug corrupting point in buffers.
Date: Wed, 02 Nov 2022 09:12:57 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

>> Really?  My reading of the code:
>>            /* As documented in Fcurrent_window_configuration, don't
>>               restore the location of point in the buffer which was
>>               current when the window configuration was recorded.  */
>>            if (!EQ (p->buffer, new_current_buffer)
>>                && XBUFFER (p->buffer) == current_buffer)
>>              Fgoto_char (w->pointm);
>> is that it's done only for the current buffer and only if it's different
>> from the "to be current buffer".
>> Am I missing something?
> Hmm.  I spent a great deal of yesterday asserting false things, then
> apologising for them.  The above was the last such false thing, for which
> I also apologise.

If we had to apologize every time we misread/misunderstood code, we'd
never get anywhere :-)

> There's clearly been a lot of confusion about window/buffer point over
> the decades which shows in the number of places such changes in buffer
> point occur, and the bugs which have sometimes resulted, like the one
> you cite above.

This is arguably one of the most subtle/delicate/complex aspect of
ELisp's semantics, indeed.


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