bug#81589: 31.0.91; Regression: window-buffer-change-functions no longer firing on set-window-configuration

martin rudalics via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <[email protected]>
Newsgroups gmane.emacs.bugs
Message-ID <[email protected]> 
 > In the latest v31, upon using `set-window-configuration' (e.g. via
 > `tab-bar-history-back') to change the buffer in a window, the
 > `window-buffer-change-functions' are not run.  Neither global nor
 > buffer-local values of this hook are run, in contrast to earlier
 > versions.
 >
 > I have verified that this is a recent regression caused by commit d6f7b2d99bd in bug#81097.  With this commit, the hook does not run.  Without it, it does.
 >
 > Reproducer for the buffer-local case:
 >
 > emacs -Q
 > Eval:
 >
 >          (add-hook 'window-buffer-change-functions
 >          	  (lambda (frame)
 >          	    (walk-windows
 >          	     (lambda (win)
 >          	       (message "W=%s WOB=%s" win (window-old-buffer win)))
 >          	     nil frame)) nil t)
 >
 > M-x tab-bar-history-mode
 > C-x right  ; *Message* showing, (<win 3 on *Messages*> *scratch*)
 > M-x tab-bar-history-back ; *scratch* showing, but hook was not called

I hopefully fixed that on the release branch.  Please try again.

Thanks, martin
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