[Fix] `shallow`: `x.find()` should not change state of `x`#2061

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sstern6 wants to merge 2 commits intoenzymejs:masterfrom

sstern6:issue1916

Commits on Jan 15, 2019

[enzyme-adapter-react-16] [new] add `shouldComponentUpdate`

sstern6
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ljharb
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[fix] `shallow`: `getNodesInternal`: delegate to the adapter’s `shouldComponentUpdate` method before updating the wrapper.

sstern6
authored and
ljharb
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