Add test for rename tracking per hunk #2039
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This PR adds a test case for the issue fixed in 7435ed5. The issue was related to the fact that, before the fix,
source_file_name
was only tracked globally, as opposed to locally, i. e. on a per-hunk basis.The test case constructs a repository that has the same rename twice, in two different branches. Tracking
source_file_name
globally is insufficient to capture this history which is why this test fails without the fix.