fix(migrations): avoid trailing whitespaces in unused imports migration #61698
+55
−117
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Follow-up to #61674 where we were leaving behind some whitespace, e.g.
[One, Two, Three]
would turn into[One ]
. These changes only preserve the whitespace if the node is preceded by a newline.This wasn't caught by tests, because they were stripping away whitespaces before asserting. I've also reworked the tests to be sensitive to formatting changes.