fix: Side menu showing when editor isn't focused.

[matthewlipski]

It probably doesn't make sense to show the block side menu if the user hovers a different element that's displayed on top of the editor, since it's distracting to have the side menu moving around when you aren't focused on the editor. See issue #201 for an example of this. This PR makes it so that the side menu is hidden when the mouse hovers an element that is not a descendant of the editor, but is within its bounding box.

Closes #201
Also helps with #185, but doesn't solve the issue completely

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Name	Status	Preview	Comments	Updated (UTC)
blocknote-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 15, 2023 3:03pm

[YousefED]

I'm not sure if I agree with this in terms of UX. For example, if I check the preview in https://blocknote-website-git-side-menu-behaviour-change-typecell.vercel.app, when I'm browsing the website, and hovering over the editor, the side menu would normally give me an indication that I can edit the document and / or take certain actions

[matthewlipski]

Do you think adding functions to e.g. force hide the menus would make more sense? I agree that it's nice to have the side menu appear even when the editor isn't focused, but I don't think there's a different condition that it makes sense to use if we automatically want to hide it in cases like #201.

[matthewlipski]

Ok so this currently breaks because the side menu itself is not a descendant of the editor. To get the current behaviour, AFAIK the only way to fix this is to make the side menu a descendant of the editor. So fixing #233 will also fix this PR and vice-versa.

UPDATE: Ignore this, I am very stupid