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bug#20489: 25.0.50; next-error-find-buffer chooses non-current buffer wi

From: Juri Linkov
Subject: bug#20489: 25.0.50; next-error-find-buffer chooses non-current buffer without good reason
Date: Wed, 28 Feb 2018 23:32:52 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

>> This works well in most cases except the case of xref buffers.
>> Below is the explanation for code from next-error with added remarks:
>> (defun next-error (&optional arg reset)
>>    (let ((buffer (next-error-find-buffer)))
>>      (when buffer
>>        (with-current-buffer buffer
>> Here the current buffer is *xref*
>>          (funcall next-error-function (prefix-numeric-value arg) reset)
>> next-error-function should navigate from *xref* to another buffer
>> and change the current-buffer to the navigated buffer, e.g. ChangeLog.1.
> If that's something next-error-function must do, let's document it
> better. Right now it only says "Function to use to find the next error in
> the current buffer" (how does one "find" an error?) and describes input
> arguments, but not the return value (which is luckily unused) or which
> buffer must be current, or which window selected at the end.

It's not yet clear which window should be selected at the end,
please see the recent bug#30646.

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