Improve outside click on Safari iOS #1712
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When tapping on an element that is not clickable (like a div), then the
`click` and `mousedown` events will not reach the
`window.addEventListener('click')` listeners.
The only event that does that could be interesting for us is the
`pointerdown` event. The issue with this one is that we then run into
the big issue we ran in a few months ago where clicks on a scrollbar
*also* fired while a click doesn't.
This issue was not an issue in React land, the
`window.addEventListener('click')` was fired even when tapping on a
`div`. This was very very confusing, but we think this is because of the
syntethic event system, where the event listener is added to the root of
your application (E.g.: #app) and React manually bubbles the events.
Because this is done manually, it *does* reach the window as well.
The confusing part is, how does React convert a `pointerdown` event to a
`mousedown` and `click`. There is no code for that in their codebase?
Turns out they don't, and turns out the events **do** bubble, but up
until the `document`, not the `window`. But since they are manually
bubbling events it all makes sense.
So the solution? Let's switch from `window` to `document`...
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This PR fixes an issue where the outside click wasn't working properly for Safari on iOS when using
the Vue version of Headless UI
Fixes: #1707