Hello,

I noticed that
  1. if you apply a custom rule to display-buffer-alist for grep, 
  occur or compilation buffers that automatically select its 
  window when the buffer if displayed ;
  2. call next-error or previous-error from an error-buffer, 
  3. compilation-goto-locus will call display-buffer for the 
  compilation buffer
  4. the selected-window have now changed, we are in the 
  compilation window, and nonetheless compilation-goto-locus will 
  call switch-to-buffer in this window instead of pop-to-buffer.

This patch is a trivial check aknowledge if we are in the 
compilation window before choosing what display function to use, 
so users can customize the behavior of compilation windows via 
display-buffer-alist without breaking the error navigation 
functionnalities.



In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 
3.24.5)
 of 2021-01-31, modified by Debian built on x86-csail-01
Windowing system distributor 'The X.Org Foundation', version 
11.0.12004000
System Description:	Debian GNU/Linux 10 (buster)

Recent messages:
Checking 70 files in /usr/share/emacs/26.1/lisp/erc...
Checking 34 files in /usr/share/emacs/26.1/lisp/emulation...
Checking 176 files in /usr/share/emacs/26.1/lisp/emacs-lisp...
Checking 24 files in /usr/share/emacs/26.1/lisp/cedet...
Checking 57 files in /usr/share/emacs/26.1/lisp/calendar...
Checking 87 files in /usr/share/emacs/26.1/lisp/calc...
Checking 105 files in /usr/share/emacs/26.1/lisp/obsolete...
Checking for load-path shadows...done
Message modified; kill anyway? (y or n) y
<select> is undefined

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--