Added check to deduplicate function type warning calls on each compon…

[andreysaleba]

Hey, I've added check to avoid duplication of messages 'Functions are not valid as React child...' for same component type.

Also, this is my first PR in React, yay.

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[andreysaleba]

Hmm, I've completed the CLA.

[andreysaleba]

#11086

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[gaearon]

Can you please test it too? You can take the existing test for it, expand it to render two times and in two places, and then verify that we only saw 2 logs (rather than 4).

[andreysaleba]

Sure, I'll update it soon

[andreysaleba]

I've added test checking deduplication of warning.

[gaearon]

I don't think this tests deduplication. You'd need to render twice to verify it works.

[andreysaleba]

Yeah, my bad, sorry.

I've added rendering of component twice to the test.

[gaearon]

Looks great. Thanks!