Correctly set Cursor in Repeat

[JLLeitschuh]

The Cursor wasn't being set in Repeat causing issues when
used for non SourceFile trees.

Signed-off-by: Jonathan Leitschuh [email protected]

What's changed?

Adds a call to setCursor in the loop for Repeat.
Also adds internal validation that Repeat is being called with the correct
Cursor set.

What's your motivation?

When using Recipe visitors on sub-trees, and those visitors called autoFormat they were failing
when the JavaSourceFile couldn't be located in the Cursor hierarchy.

Anything in particular you'd like reviewers to focus on?

Anyone you would like to review specifically?

Have you considered any alternatives or workarounds?

Any additional context

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[JLLeitschuh]

@sambsnyd I think this is one for you to take a look at ideally.