breaking(Portal|Popup): replace mouseOver event listener with mouseEnter

[dvdzkwsk]

Breaking Change

Fixes #978.

This PR replaces all mouseOver-related <Portal /> events with mouseEnter to be consistent with mouseLeave. This affects the <Portal /> component directly, as well as any which implement it, which at this time includes <Popup />.

Upgrade Guide

All related mouseOver props should now be mouseEnter. This will also impact the logic of these handlers since they are now only called when the element is entered, not (incorrectly) on enter and exit.

BEFORE

const onMouseOver = () => {
  console.log('Entered (or exited!!) the element in the portal')
}

<Portal onMouseOver={onMouseOver} trigger={<h2>hello</h2>} />

AFTER

const onMouseEnter = () => {
  console.log('Entered the element in the portal')
}

<Portal onMouseEnter={onMouseEnter} trigger={<h2>hello</h2>} />

[codecov-io]

Current coverage is 95.81% (diff: 100%)

Merging #989 into master will not change coverage

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[levithomason]

I know you're a busy fellow, any progress here @davezuko? Icon docs are borked without this guy.

[dvdzkwsk]

No, perhaps I will take a stab again tonight. There's a failing test or two that I'm absolutely stumped on, but maybe a fresh look will solve it.

[levithomason]

Cool, LMK.

[levithomason]

Nice, this looks good. Want to add some breaking change notes as laid out in #978 (comment)? Also, the title will then be breaking(Portal): ....

[dvdzkwsk]

@levithomason how is this?

[levithomason]

Looks great, thanks!

[levithomason]

Released in [email protected].