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We still have to fix sidebar/toolbar visibility though.

The mode is now always decided by the GSettings preference.

By default there is no more desktop anymore, so its kinda weird to have it
highly visible in the ui, as there should be nothing there.

We support it directly where we already care now.

We can use normal actions for those, and use the custom actions in the
toolbar, as we already do.

The rationale being the same as for NautilusZoomAction

Now that we don't use it on the toolbar anymore, it's useless to keep
around.

Don't roundtrip through NautilusWindowSlot, as that's what it would do
anyway.

The toolbar is insensitive when not active anyway, so this is useless.

So that the current back.forward state propagates to menus.

Why on earth should it be somewhere else?

Makes things more readable.

It's not needed anymore

It's not that useful now that nautilus is not a long running application
anymore.

We can't have more than one active slot at the same time anyway.