bug#41338: Toolbar-bug in Emacs 27.0.91/Pretest

[Juri Linkov <juri@linkov.net>]

>>> isearch uses overriding-terminal-local-map, so the proper test case is:
>>>
>>> (setq overriding-terminal-local-map
>>>       (let ((map (make-keymap)))
>>> 	(define-key map [delete-frame]
>>> 	  (lambda (&rest ignore)
>>> 	    (interactive)
>>> 	    (message "DELETE-FRAME")))
>>> 	(define-key map "!"
>>> 	  (lambda (&rest ignore)
>>> 	    (interactive)
>>> 	    (message "!")))
>>> 	map))
>>>
>>> and indeed typing '!' you get the message,
>>> but no message when clicking the `X' icon.
>>
>> The docstring of 'overriding-terminal-local-map' says:
>>
>>   Per-terminal keymap that takes precedence over all other keymaps.
>>
>> so maybe this is right for a *per-terminal* keymap not to react
>> to window events such as clicking the `X' icon?
>
> If there is no bug here, then I see two possible solutions for isearch:
>
> 1. use special-event-map in isearch.el the same way as isearch.el uses
>    overriding-terminal-local-map;
>
> 2. use the hook ‘delete-frame-functions’ to explicitly exit isearch.

Since nobody proposed a better solution, here is a fix:

diff --git a/lisp/isearch.el b/lisp/isearch.el
index 505837de988..005376f8257 100644
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -1330,6 +1333,7 @@ isearch-mode
   (add-hook 'pre-command-hook 'isearch-pre-command-hook)
   (add-hook 'post-command-hook 'isearch-post-command-hook)
   (add-hook 'mouse-leave-buffer-hook 'isearch-mouse-leave-buffer)
+  (add-hook 'delete-frame-functions 'isearch-done)
   (add-hook 'kbd-macro-termination-hook 'isearch-done)
 
   ;; isearch-mode can be made modal (in the sense of not returning to
@@ -1430,6 +1434,7 @@ isearch-done
   (remove-hook 'pre-command-hook 'isearch-pre-command-hook)
   (remove-hook 'post-command-hook 'isearch-post-command-hook)
   (remove-hook 'mouse-leave-buffer-hook 'isearch-mouse-leave-buffer)
+  (remove-hook 'delete-frame-functions 'isearch-done)
   (remove-hook 'kbd-macro-termination-hook 'isearch-done)
   (when (buffer-live-p isearch--current-buffer)
     (with-current-buffer isearch--current-buffer