Add open, onOpen, onClose props to Menu component

[methyl]

Being able to control Menu visibility from the outside, using a prop and callbacks, opens up a lot of possibilities.

For example, one can use the Menu without a Button trigger as a context menu, while keeping all the great accessibility features @headlessui/menu provides.

It fixes #649, #1937 and similar PR for Popover will fix #828

I know you normally don't accept PRs from the outside, but since I'll be keeping the fork up to date for our internal usage, I thought it's worth considering.

Vue implementation is missing as I'm not fluent in Vue, but I think the implementation should be just as straightforward as for React.

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[adamwathan]

Hey thanks for the PR! This is something we do want to support and have run into it on our own projects, but I'm not totally convinced yet that this is the right API so I’m going to close this as-is.

Unfortunately can’t make it a priority to think through this particular feature or decide on any APIs right now so I’m not able to provide any specific feedback or suggestions on what to do differently to increase the chances of it being merged.

Thanks regardless, I appreciate the contribution 👍🏻 Hopefully this is something we can dedicate some time to in the future — in the mean time if you really, really need this you always have the option to fork until we've implemented an API for this that we're happy with.

[methyl]

@adamwathan awesome, that works. Fork is good enough for now, but keep us posted!

[smaccoun]

Thannks for this @methyl. This is a really useful feature and I hope it gets merged in. I know @adamwathan you have probably a lot of priority things, but I wonder if you could reconsider just merging this as the API to me seems at least as straightforward as I'd imagine it. Seems at least good enough to iterate on. Just my 2 cents