[6.x] Allow response to return first view

[browner12]

There are currently a couple ways to return a view. The simple standard way is:

return view('my/view', ['data']);

If you need to customize the response a little you can tweak it to this:

return response()->view('my/view, ['data'], 404, ['headers']);

Some code takes advantage of the ability to pass an array of views, and return the first one that exists.

return view()->first(['my/view1', 'my/view2'], ['data']);

It would be nice to be able to manipulate the response status and headers, but also use the view first functionality.

I'm proposing allowing response()->view() to accept either a string or array as the first parameter. If the first parameter is a string, it will behave as it does currently. If it receives an array, it will use the view first logic.

return response()->view(['my/view1', 'my/view2'], ['data'], 404, ['headers']);

If we're uncomfortable adding some magic to this method, I also considered making it a separate method on the ResponseFactory so it would be called as:

return response()->viewFirst(['my/view1', 'my/view2'], ['data'], 404, ['headers']);

which I could switch to.

I was also having trouble locating where tests are for this logic. If someone could point me in the right direction that would be appreciated.