Trigger dragenter before dragover

[tmcw]

In our codebase, we rely on dragenter occurring before drop, and that's also the cycle that would be expected out of an actual user. This PR adds a dragenter event before it triggers drop.

[abramenal]

Hi @tmcw
Thanks for the contribution!
I would suggest to also add dragleave event just to keep it consistent in that case. Can you please do that here?
Also, all the handlers (and this particular as well) returns chainable cy object so please make it here as well.
After these changes come I'll release this with new plugin version.

@all-contributors add @tmcw for code

[abramenal]

@all-contributors add @tmcw for code

[allcontributors]

@abramenal

I've put up a pull request to add @tmcw! 🎉

[abramenal]

@tmcw v3.4.0 containing this fix is out.
Thanks again for contribution!