GNU bug report logs - #3356
23.0.93; Loss of undo info in calc

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Jay Belanger <jay.p.belanger <at> gmail.com>
To: Leo <sdl.web <at> gmail.com>
Cc: emacs-pretest-bug <at> gnu.org
Subject: Re: 23.0.93; Loss of undo info in calc
Date: Sat, 23 May 2009 10:48:23 -0500

Leo <sdl.web <at> gmail.com> writes:
...
> 1. M-x calc
> 2. do some calculation for example: ' sqrt ( x ) RET a t x 5 RET
> 3. type q to quit calc
> 4. M-x calc to bring it back
> 5. type U
>
> You will get "No further undo information is available".

calc-quit sets the undo list to nil on purpose, probably to save limited
memory in the early days.   If there are still memory considerations,
then calc-quit could truncate the undo list rather than remove it,
otherwise it'd be easy to have calc-quit not do anything with the undo
list.

> Incidentally, I wonder whether making the two windows dedicated is more
> desirable than current behaviour.

Maybe, but I wonder if this would cause problems in some situations.
How would full-calc be affected, for instance.

Jay

Message #12 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Leo <sdl.web <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Cc: emacs-pretest-bug <at> gnu.org
Subject: Re: bug#3356: 23.0.93; Loss of undo info in calc
Date: Sun, 24 May 2009 01:25:20 +0100

On 2009-05-23 16:48 +0100, Jay Belanger wrote:
>> 1. M-x calc
>> 2. do some calculation for example: ' sqrt ( x ) RET a t x 5 RET
>> 3. type q to quit calc
>> 4. M-x calc to bring it back
>> 5. type U
>>
>> You will get "No further undo information is available".
>
> calc-quit sets the undo list to nil on purpose, probably to save limited
> memory in the early days.   If there are still memory considerations,
> then calc-quit could truncate the undo list rather than remove it,

I think it should do its best to protect user's data. This option seems
very desirable.

> otherwise it'd be easy to have calc-quit not do anything with the undo
> list.

-- 
.:  Leo  :.  [ sdl.web AT gmail.com ]  .: I use Emacs :.

Message #22 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Leo <sdl.web <at> gmail.com>
To: jay.p.belanger <at> gmail.com
Cc: 3356 <at> debbugs.gnu.org, emacs-pretest-bug <at> gnu.org
Subject: Re: bug#3356: 23.0.93; Loss of undo info in calc
Date: Sun, 02 Aug 2009 15:21:52 +0100

On 2009-05-23 16:48 +0100, Jay Belanger wrote:
> Leo <sdl.web <at> gmail.com> writes:
> ...
>> 1. M-x calc
>> 2. do some calculation for example: ' sqrt ( x ) RET a t x 5 RET
>> 3. type q to quit calc
>> 4. M-x calc to bring it back
>> 5. type U
>>
>> You will get "No further undo information is available".
>
> calc-quit sets the undo list to nil on purpose, probably to save limited
> memory in the early days.   If there are still memory considerations,
> then calc-quit could truncate the undo list rather than remove it,
> otherwise it'd be easy to have calc-quit not do anything with the undo
> list.
>
>> Incidentally, I wonder whether making the two windows dedicated is more
>> desirable than current behaviour.
>
> Maybe, but I wonder if this would cause problems in some situations.
> How would full-calc be affected, for instance.
>
> Jay

It seems this bug can be closed.

-- 
Leo's Emacs uptime: 1 day, 15 hours, 20 minutes, 27 seconds

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