bug#7787: 23.2; wrong meaning for mouse-2 while in search mode

[Juri Linkov]

>     This thread is very familiar:
>     https://lists.gnu.org/archive/html/help-gnu-emacs/2011-11/msg00116.html

There is another similar thread:
https://lists.gnu.org/archive/html/emacs-devel/2019-05/msg00003.html

> I think this code was the answer for me back then:
>
>> (defun isearch-mouse-2 (click)
>>  "..."
>>  (interactive "e")
>>  (isearch-yank-x-selection)
>>  (deactivate-mark t))

Do you propose to add this to isearch.el?