Fix leak in slidesInView event

[fcasibu]

Hello first time trying out this package and I love everything about it but there's just one thing that's causing me some issues regarding the slidesInView event. I've created this Sandbox to demonstrate the issue.

To reproduce:

1. Try not to resize the sandbox and see the counter "called" gets incremented by 1 perfectly fine
2. Resize the sandbox
3. Wait for the autoplay to slide automatically or slide it yourself
4. Counter "called" gets incremented by A LOT and this shouldn't happen

I've added engine.slidesInView.destroy() in the deactivate function to fix the issue in embla-carousel package.

We can also listen to the reinit event to destroy the event but I feel like this shouldn't be done on the end user but on the package's side.

[davidjerleke]

@fcasibu thank you very much for your effort! Have you tried the changes to see if it solves the problem?

Best,
David

[fcasibu]

Hey @davidjerleke I've tested it on the playground for react and it does indeed solve the problem. Thanks 🙇

[davidjerleke]

@fcasibu thank you for your swift response. Nice work and welcome to the contributors club 🎉!

[fcasibu]

Seems like it broke a lot of tests regarding intersectionObserver should've added disconnect on the mock, sorry about that @davidjerleke

[davidjerleke]

@fcasibu no worries. It's just a minor thing. I can fix it. Thanks for informing me though 👍.

[davidjerleke]

@fcasibu done 🙂.

[davidjerleke]

@fcasibu I've released v8.0.0-rc15 which includes this PR.