Alex Reid

Add failing test for issue #4073

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## Description Adds failing test for issue #4073. refs #4073

Window drags started from the blank area above the tree view do not work reliably with a custom-inset titlebar

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Steps to reproduce: - Set the title bar style to 'custom-inset' - With the tree view visible with enough entries that the view becomes vertically scrollable, scroll to the top...

Errors from parent-level validation of nested serializer fields break the browsable API.

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## Checklist - [x] I have verified that that issue exists against the `master` branch of Django REST framework. - [x] I have searched for similar issues in both open...