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Finally. 'git diff HEAD~14 HEAD~2 board.kicad_pcb' working reliably. It generates something like this:
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I so desperately hope that this isn't something that other kicad users have just quietly had without pain.
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Due to some annoyances with how git diff tools work, doing diffs of schematics needs to be run as a script: "git-schematic-diff HEAD~20 HEAD~15 board.sch But it WORKS.