Sidebar should be more persistent maybe?

[leftiness]

• I still want to be able to go to site.com/?sidebar=1 and get an opened sidebar.
• I think maybe I should keep the sidebar open sometimes. If I go from site.com/mail/1 to site.com/mail/2, I want my sidebar to stay open across those two links.
• Therefore, I need to have a combination of URL option and sidebar state on redux.
• If I navigate to a link which has ?sidebar (with any value... but I'll use sidebar=1 in my links) in the URL options, toggle the sidebar to open by setting that state on redux to true.
• When I navigate to a link which doesn't have the ?sidebar option set, it won't close the sidebar. It'll look at what's on the state to determine whether it should be open.

[leftiness]

How would this work exactly?

If the application component dispatches onhashchange() to say that we're at site.com?sidebar=1, then that goes to the navigation reducer, which sets state.navigation.location. Then the app renders again. How do I get it to also set state.sidebar?

Can the navigation reducer alter state.sidebar? I don't think so. There needs to be a sidebar reducer. I can't dispatch two actions onhashchange (pretty sure that's actually something they say is wrong).

Maybe I can have multiple reducers which are listening for the same action and doing different things as a result? Do reducers work like express middleware like that? If so, then I could just listen for the NAVIGATION action and then set state.sidebar to show the sidebar.