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fix: incorrect regular expression matching diffcmd #62

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current diffcmd_header: ^diff.* (.+) (.+)$
fixed diffcmd_header: ^diff .* (.+) (.+)$

Using the old diffcmd_header may result in lines starting with words like "different" being incorrectly matched as a diff header. Fixing this by adding a blank space.

example: this commit in Linux kernel

image

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