Could not auto close unsaved editor when delete

[xqzlgy2]

The newly added "delete" feature #343 works well when we try to delete unchanged files. However, if we try to delete file with unsaved changes, the editor will not be closed and will looks like below:

This is not consistent with native file explorer's behavior and may also cause user lose their changes before deletion. However, this part is hard to fix due to API limitation, since many needed functions are encapsulated within the implementation of VS Code built-in commands. If microsoft/vscode#107566 could be solved, we can fix this problem easily.