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bug#16038: 24.3; latest change to with-help-window makes temp-buffer-bro

From: Glenn Morris
Subject: bug#16038: 24.3; latest change to with-help-window makes temp-buffer-browse useless
Date: Thu, 10 Jul 2014 03:20:56 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

Leo Liu wrote:

> On 2014-07-07 21:54 -0400, Glenn Morris wrote:
>> If you want to do this (I know you already did...), you need to add an
>> incompatible change entry to NEWS about this, and you need to audit
>> every single use of with-output-to-temp-buffer to find the ones that
>> expected their output buffers to be in help mode.
> We made that change to prove the above two lines cause no harm other
> than not enabling help-mode. At some stage and probably pretty soon, we
> might merge the two macros with-output-to-temp-buffer and
> with-temp-buffer-window under one name (the former looks like a simple
> case of the latter). So the change is intermediate.

Sorry, this makes no sense to me.

with-output-to-temp-buffer is a documented macro with a specific purpose.
I shall now do the tedious thing of quoting the manual:

   This function executes the forms in BODY while arranging to insert
   any output they print into the buffer named BUFFER-NAME, which is
   first created if necessary, and put into Help mode.
   If the forms in BODY do not change the major mode in the output
   buffer, so that it is still Help mode at the end of their
   execution, then `with-output-to-temp-buffer' makes this buffer
   read-only at the end, and also scans it for function and variable
   names to make them into clickable cross-references.

Now it does not do any of that.

The normal way to do this kind of thing is to introduce a new macro that
does whatever new thing you want, and deprecate the old one. Not to just
half-arsedly change the old one to do something else, without updating
any of the documentation or callers.

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