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

[Juri Linkov]

> 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?