When closing an unsaved tab the editor "freezed"

Every time when i want to close an unsaved tab the seems to freeze. Its not a real freeze but i dont know how to name it. I can do anything but close the tab or the editor itself.

tested on windows

Start by reproducing the issue on Windows with an unsaved tab, then trace the editor's tab-closing flow and any unsaved-changes handling. Done means an unsaved tab and the editor can be closed without the application becoming unresponsive.

Written by the indexing model from the issue text.