Fix: Reload on mount

[joetannenbaum]

This PR should fix an issue where we try to save the initial scroll state before we even have any history state.

Should fix #2195

[danmatthews]

Thanks @joetannenbaum

[blackjak231]

@joetannenbaum the issue seems to still be relevant on Safari iOS. Here is the line indicated by Sentry :

Type Error: null is not an object (evaluating 'window.history.state.page')

{snip} 
solve().then(()=>{this.doReplaceState({page:window.history.state.page,documentScrollPosition:e},this.current.url)}))}getScrollRegions(){retu 
{snip}

However, I have no idea why it's triggering an error and I'm still investigating.

[cgaube]

We are also seeing on firefox

inertia/packages/core/src/history.ts

Line 134 in 1b29f8a

return window.history.state.scrollRegions || []

  public getScrollRegions(): ScrollRegion[] {
    return window.history.state.scrollRegions || []
  }

should be

  public getScrollRegions(): ScrollRegion[] {
    return window.history.state?.scrollRegions || []
  }

I guess the entire file needs to be looked at a bit knowing that state can be null