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Issue: Support Git's --color-moved output through style mapping and ANSI parsing

Issue: Support Git's --color-moved output through style mapping and ANSI parsing: a task in LegoFlow-SWE (Harbor dataset). Problem Delta does not correctly handle Git's --color-moved output. When Git emits moved-code highlighting, the moved sections arrive as raw ANSI‑styled input. Delta treats…

The task

**Problem** Delta does not correctly handle Git's `--color-moved` output. When Git emits moved-code highlighting, the moved sections arrive as raw ANSI‑styled input. Delta treats these raw styles differently from its own computed diff styles, leading to two problems:

Part of Lego-X/LegoFlow-SWE.