Menu: option to close the menu if the mousedown-target does not exist in the DOM anymore on mouseup

[ghost]

Example: https://stackblitz.com/edit/react-ts-1jsyjo?file=App.tsx

Reproduce:

1. Open the menu (click the "Some menu" button)
2. Click the span below the menu button (for the mousedown event, we replace it with the input element)

Expected: The menu should get closed
Actual: The menu stays open

As I understand, when deciding whether to close the menu on click, this logic intentionally ignores this use-case, i.e. does not close it.
What do you think about making this logic somehow configurable?

Quick ideas:

1. An optional param shouldCloseMenuIfMouseDownTargetNotInDOM (or some better name :))
2. A more generic optional callback param shouldCloseMenu: (initialTarget: HTMLElement, eventualTarget: HTMLElement, <any other relevant args>) => boolean
3. An optional param shouldCloseMenuOnMouseDown (or a more general name that also covers the touchStart event). As the name suggests, if this is true, the menu would get closed on mouseDown/touchStart instead of on-click.