calling next(false); unexpectedly clears forward history

[pretzelhammer]

Version

3.0.1

Reproduction link

https://codesandbox.io/s/7l33b

Steps to reproduce

• Click through the router-links on the page to get some history (a prompt will pop up on every navigation, click "OK")
• Go back a few times (using either the browser back button or the HTML "go back" button)
• After you are somewhere in the middle of your history/navigation stack, go forward or back (again using either the browser or HTML buttons) but this time when the prompt pops up asking you if you want to proceed, click "Cancel"
• All of your forward history is gone

What is expected?

I don't expect all of the forward history to disappear just because a component cancelled navigation, i.e. next(false);

What is actually happening?

All of the forward history is disappearing after a component cancels navigation, i.e. next(false);

[posva]

Duplicate of #2814