Returns the ref-based color index of the given ref (0 = current ref, 1 = remote ref, 2 = base ref), or undefined when the ref is none of the provider's current history item refs. Mirrors VS Code's scm graph color map.
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Returns the ref-based color index of the given ref (0 = current ref, 1 = remote ref, 2 = base ref), or
undefinedwhen the ref is none of the provider's current history item refs. Mirrors VS Code's scm graph color map.