Use customHistory url instead of internal url in render if available

[hesselbom]

Currently, when using 'history' module as customHistory, and blocking the history change, the internal state url in Router is still updated, even if window location isn't. This pull request aims to fix this.

[developit]

@hesselbom how are you blocking the history change? Just trying to set up a demo.

[hesselbom]

/** @jsx h */
import { h, render } from 'preact'
import { Router, Link } from 'preact-router'
import createHistory from 'history/createBrowserHistory'

let history = createHistory()
history.block('Are you sure you want to leave this page?')

let ViewOne = () => <Link href='/two'>Go to view two</Link>
let ViewTwo = () => <Link href='/'>Go to view one</Link>

render((
  <Router history={history}>
    <ViewTwo path='/two' />
    <ViewOne default />
  </Router>
), document.body)

When trying to switch view but canceling in the prompt the view will update but the url won't.

[developit]

oh wow, I didn't know history.block was even a thing!

[hesselbom]

Neither did I until I conveniently found it when needed for a very specific use case! ;)

[developit]

Just circling back to this - shouldn't this handler be getting fired to take block() into account?
https://github.com/developit/preact-router/pull/140/files#diff-1fdf421c05c1140f6d71444ea2b27638R193