mq: avoid data loss upon qfold + qmv (issue3058) When renaming a patch A as B where B was previously qfolded into A and therefore marked as removed, a versioned MQ would first restore B before marking it as a copy of A, thus losing A changes. The undelete() call is probably a left-over, wctx.copy() explicitely handles the case where the destination is removed. Also note that status command represents "hg rm b; hg mv a b" as: A b a R a which explains the first hunk in test-mq-qrename.t.

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