Problem

When users navigate to a page with a form prefilled from the router location, e.g. they clicked a <CloneButton>, the <SaveButton> is disabled by default because the form isn't dirty yet.

Fixes #9217.

Solution

As react-hook-form does not provide a way to set the form values from an object while setting the form dirty, we made the <SaveButton> check for the presence of a record in the router location too.

How To Test

• Run the simple example
• Click any post
• Click the Clone button
• Check that all save buttons are enabled

Additional Checks

• The PR targets master for a bugfix or a documentation fix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

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