Lightbox doesn't close upon hashchange to previous state where lightbox wasn't open

[jameshopkins]

Once a user opens a lightbox, and they click the browser's 'back' button (which changes the URL hash to the previous state), the lightbox doesn't close too.

[peter-mouland]

the opening and closing is handled by the hash-manager on line 93.
I reckon if you add a new config option, passing a third option to the hash.register would probably do what you want it to.
A good chance to split this out into its own component..

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