wizard_router : back function does not load previous route in routes if not already loaded in state.

[WilliamMrc]

Steps to reproduce :

• load wizard_router with 3 routes : 'route1', 'route2', 'route3'. => 'route1' is loaded
• call jump('route3') => 'route3' is loaded
• call back() => 'route1' is loaded and not 'route2'

code exploration :

back function search for previous route in routes. If the previous route is not found in state, state.lastIndexWhere((settings) => settings.name == previous) returns -1 and the route at index 0 of state is loaded.

Solution proposition :

if route is not in state, call _loadRoute and place it before current route in state.

I can try to resolve it with a PR if you think it's a good solution.

[WilliamMrc]

I can see from other part of the controller that this behavior is intentional. another solution is to add a previous() function that explicitly navigate to previous route in wizard. Is it a better solution ?

[spydon]

@WilliamMrc I guess back means more like pop:ing, than going to the route before the current one. A previous method could work!

[WilliamMrc]

@spydon thanks for the feed back. please tell me if my PR #433 is ok for you.