Add option to go back in history on successful Resource update/create

[wdelfuego]

The issue

When users cancel the editing of a Resource by clicking cancel, they are sent back to where they came from. That is useful when the Edit view was directly opened from a custom Dashboard card or from a related resource's 'hasMany' listing; the user can pick up right where they left off after they decide not to edit the item.

When the user saves their edits, however, they are always sent to the Resource's redirectAfterUpdate location. This breaks the user's flow and forces them to manually navigate back to the place from where they initially opened the Edit view.

The same issue applies to opening an Edit view for resource B from the 'hasMany' listing on the detail view of resource A. Cancelling the edit leads back to the detail of A while saving it leads to the detail of B. This is an inconsistency in how Nova behaves that I think would be nice if we could customize it. (as default behavior the way it currently works is fine).

The solution

The feature that'd be nice to have would be to add something like App\Nova\Resource::redirectBackAfterUpdate() in the backend and to update the handleResourceUpdated in the frontend to return window.history.back() in that case, instead of Nova.visit(redirect). The same customization option should probably apply to resource Creation.

My use case

I have a custom card on my Dashboard that indicates Resources that need attention. It gives the user an 'Edit' button directly to the Resources' edit view. I want users to come back to this Dashboard whether they cancel or save the Resource edit, so they can directly see what changed as a consequence of their edits:

I could hardcode that dashboard in the redirectAfterUpdate location, but that only solves this specific instance and wouldn't allow me to link to the same resource from a different location, nor does it solve the issue when editing objects from a HasMany relationship. It would also cause problems for users who have permissions to edit those resources, but not to see that specific Dashboard.