[change] deprecate getParentElement in favor of local element.

[diasbruno]

To keep things simple, each Modal can be placed on any level
of the react's tree and it will do a proper clean up when it's
time to unmount the component. Also, it make things simple enough
to deal with overlapped modal.

It will use a local element, created by which will still be visible by
getting node property.

Changes proposed:

• Use a div provided by the instance of to setup things.
• Each <Modal /> can perform its own clean up.

Upgrade Path (for changed or removed APIs):

• Remove getParentElement.

Acceptance Checklist:

• All commits have been squashed to one.
• The commit message follows the guidelines in CONTRIBUTING.md.
• Documentation (README.md) and examples have been updated as needed.
• If this is a code change, a spec testing the functionality has been added.
• If the commit message has [changed] or [removed], there is an upgrade path above.

[coveralls]

Coverage decreased (-0.03%) to 84.923% when pulling efb0954 on diasbruno:feature/deprecate-get-parent-element into f5d95e2 on reactjs:master.

[coveralls]

Coverage decreased (-0.03%) to 84.923% when pulling efb0954 on diasbruno:feature/deprecate-get-parent-element into f5d95e2 on reactjs:master.

[coveralls]

Coverage decreased (-0.05%) to 85.511% when pulling 376c4e6 on diasbruno:feature/deprecate-get-parent-element into 6f73764 on reactjs:master.

[coveralls]

Coverage decreased (-0.05%) to 85.511% when pulling 376c4e6 on diasbruno:feature/deprecate-get-parent-element into 6f73764 on reactjs:master.

[coveralls]

Coverage increased (+0.08%) to 85.794% when pulling c5b148d on diasbruno:feature/deprecate-get-parent-element into b67ad54 on reactjs:master.

[coveralls]

Coverage increased (+0.08%) to 85.794% when pulling c5b148d on diasbruno:feature/deprecate-get-parent-element into b67ad54 on reactjs:master.

[adrianq]

Hi! Any plan to get this merged in the short term?

[diasbruno]

Hi @adrianq, I don't know, I believe it still needs some tests and It's also a breaking change, so I'm not sure.

[diasbruno]

If you have some time you can review this PR. :)