[6.x] Support executing closures outside of the current selector scope

[Infamoustrey]

There are scenarios, particularly when writing logic to encapsulate components that don't necessarily have a linear structure in the dom, that you might want to run certain logic outside of your current selector scope. This function simply executes a closure outside of the current scope.

Consider the following html generated from a js component from a popular react framework:

<div class="mui-select">
   <label>My Label</label>
   <div>...input display</div>
</div>

... other portions of the page

<div class="mui-menu">
  <ul>
     <li class="select-option">1</li>
     <li class="select-option">2</li>
     <li class="select-option">3</li>
  </ul>
</div>

To interact with this component before you had to do something like this:

public function selectFromDropdown(Browser $browser, string $value)
{ 
    $prefix = $browser->resolver->prefix;
    $browser->resolver->prefix = "";
    $browser->within('.mui-menu', function ($browser) use ($value) {
           // do unscoped stuff
     });
    $browser->resolver->prefix = $prefix;
}

Now the code will look something like this:

public function selectFromDropdown(Browser $browser, string $value)
{ 
    $browser->elsewhere('.mui-menu', function ($browser) use ($value) {
        // do unscoped stuff 
    }); 
}

Closes #783

[taylorotwell]

Can you make a PR to laravel/docs to document this?

[Infamoustrey]

Will do!