fix blocking navigation when frequently switching between pages

[AnthonyXcode]

Steps to produce the issue

1. When two pages use useRouteChangeEvents
2. The user switch between these two pages few times
3. The user route to other pages which doesn't have useRouteChangeEvents
4. All links in the app don't work

Root cause

update state actions is not in-sync, when we call request => revoke => request at the same time. Actually, the state inside the blocks are the same value but not update one by one.

How to fix

Use global variable to store the requests ID to make sure the changes is in order.

[run4w4y]

Wow, thank you very much for this PR!
Unfortunately, I'm on an overseas trip away from home right now, I hope you don't mind if I'll take a look after I get back in a week or so.
Once again, really grateful for this contribution, since I've noticed the issue myself a few times but never bothered to look deeper into it