Add feature menuSelectionCallback to pull updatedValues onClick of a ListItem

[jwmann]

Fixes #112

[codecov-io]

Codecov Report

Merging #113 into master will decrease coverage by 0.39%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master     #113     +/-   ##
=========================================
- Coverage   40.97%   40.57%   -0.4%     
=========================================
  Files           6        6             
  Lines         205      207      +2     
=========================================
  Hits           84       84             
- Misses        121      123      +2

Impacted Files	Coverage Δ
src/types/index.js	33.33% <ø> (ø)
src/defaultProps.js	53.84% <ø> (ø)
src/SuperSelectField.js	38.21% <0%> (ø)
...terial-ui-superselectfield/src/SuperSelectField.js
...an/material-ui-superselectfield/src/types/index.js
...Sharlaan/material-ui-superselectfield/src/utils.js
.../material-ui-superselectfield/src/FloatingLabel.js
...ial-ui-superselectfield/src/SelectionsPresenter.js
...n/material-ui-superselectfield/src/defaultProps.js
src/utils.js	36% <0%> (ø)
... and 5 more

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[jwmann]

I'm trying to write some tests for this but it seems almost impossible.

describe('menuSelectionCallback', () => {
  it('should return updatedValues', () => {
    const wrapper = shallowWithContext(<SuperSelectField showAutocompleteThreshold="always">{testChildren}</SuperSelectField>)
    wrapper.simulate('click')
    const firstChild = wrapper.find('ListItem').first()
    firstChild.simulate('click', {
      preventDefault: () => {
      },
    });
    expect( wrapper.instance().props.menuSelectionCallback ).toHaveBeenCalled()
  })
})

Keep getting an error
TypeError: Cannot read property 'focus' of undefined or undefined is not an object (evaluating '_this.root.focus')

I also just noticed #23
I didn't realize this was a hot button issue.
I do think setting the state based onClick rather than when the menu is closed is necessary.
Not only that, but the original docs were actually incorrect as it said the state was change onClick but that's not the case with onChange.

[jwmann]

Unfortunately because of #105 I can't even run this on my project without published merges.
I'm open to discussing these changes as well as test coverage. Hopefully we can resolve this without breaking any backwards compatibility.

[Sharlaan]

solved with #119