[dashboard] Dragging state not reset in Chrome on drop in the address bar

[web-padawan]

Description

When dragging the item and dropping it to the browser address bar, this happens:

dashboard-drag.mp4

Looking at the devtools I see that dragging attribute is not reset so the item isn't shown.

Expected outcome

Expected the item to be visible after dragging.

Minimal reproducible example

Use the dev page.

Steps to reproduce

Drag the item to the browser address bar and drop it (see the video). Note, seems to only happen in Chrome.

Environment

Vaadin version(s): 24.6 (dashboard branch)
OS: Mac OS

Browsers

Chrome

[tomivirkki]

Seems that in case (or if you drop outside the browser window) a "dragend" event never gets dispatched, which is against how HTML DnD should work: https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API/Drag_operations#finishing_a_drag

That would suggest it could be another DnD-related regression in Chromium (in addition to #7770)