Dragger breaks when multiple files are selected and some are invalid #10953
OSX High Sierra, Chrome
Steps to reproduce
Dragger is configured to allow only jpeg files.
What is expected?
Begin upload for valid file and reject invalid file.
What is actually happening?
An exception the thrown in the console - Warning: Each child in an array or iterator should have a unique "key" prop. This error is also throws sometimes - Encountered two children with the same key,
Only occurs when valid and invalid files are selected. Works fine when all files are valid or invalid.
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