Fix modal event listeners

[ghost]

Add a check to ensure that the element that triggered the event is still present in the DOM.

closes #37126

Supersedes #37143

[GeoSot]

@jbroutier Thank you for your PR.
Can you please a test-case to justify the change?

[ghost]

@GeoSot I've added a test case as requested.

I've also updated the fix to check both events instead of just the mousedown one for testability purposes. Otherwise in one case I cannot trigger the event handler of the modal and in the other case I cannot reproduce the bug.

[GeoSot]

I've linted a bit, but got another idea too.
You may, instead of two contain checks, to try this

        if (this._element !== event.target || this._element !== event2.target) {
          return
        }

it should work too and it covers both cases