Bug#1120136: gbp-pq: Use of --diff-algorithm=default will lead to a lot of churn with Git 3.0

[Gioele Barabucci]

Control: tags -1 patch

A tiny MR to fix this problem can be found at

https://salsa.debian.org/agx/git-buildpackage/-/merge_requests/66

Regards,

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Gioele Barabucci