How to reproduce
- open two windows, window A contains any number tabs and Window B only contains one tab.
- close Window B (close the window or close the tab).
- do "Reopen closed tab" in window A, then window A will lose focus, but no new window opened!
- If select "Open tabs form the previous session" in setting "When Edge starts". Edge will restore window A and B after restart.
Something may helpful
after close a window contain more than one tab, "Reopen closed tab" should be replaced by "Restore Window".
It's HARD to reproduce!
- new "User Data" without account login: cannot reproduce.
- new "User Data" with my account: cannot reproduce when first run. can reproduce after fully restart.
- disable all sync option and reset sync, then create new "User Data" with my account (Syncing is turned on by default when Edge starts for the first time): cannot reproduce when first run. can reproduce after fully restart.
- new "User Data" with my account and disconnect the Internet: cannot reproduce.
It looks like my account has been polluted by a sync option that cannot be turned off or cleared on the server. This bug stays with me as long as I login my account and turn on sync.
Update: My friend reproduced successfully. I guess that login any account can reproduce this bug.