[RedirectClass] toReferrer

In my project is is likely users will open multiple tabs but continue navigating on the original tab. In this case, using redirect()->back() produces unexpected behavior. Example

• user opens /list/
  
• user opens /list/item/1 in a new tab (in background)
  
• user posts form on /list
  
• controller handles form posts and does a
  
  Code:

  redirect()->back()
  
  
• user is now redirected back to /list/item/1 since it is the last visited url in the session
  

The behaviour of

Code:

redirect()->back()

is well documented and I understand the choice to use the session for safety.

However, would there be enough of a use case to add  a

Code:

redirect()->toReferrer()

function to cover the case I just described? Of course, this would be not much more than a convenience function as the functionality can already be achieved with other functions from the framework.

I would be happy to open a PR.