bug#53910: 29.0.50; context-menu-mode breaks help in read-only buffers

[Juri Linkov]

>> It was surprising that select-window invoked on the same selected window
>> switches the buffer to the originally displayed window-buffer.
>> Maybe Martin could explain this.
>
> Do you mean that
>
> (with-temp-buffer
>   (let ((buffer (current-buffer)))
>     (select-window (selected-window))
>     (message "before %S after %S" buffer (current-buffer))))
>
> is surprising?  But 'select-window' only does
>
>   In addition, make WINDOW’s buffer current and set its
>   buffer’s value of ‘point’ to the value of WINDOW’s ‘window-point’.
>
> as advertised.  Or do you mean something else?

Yep, this is what I meant.  I expected it no-op in this case,
but the documented behavior is fine.