Suspicious code in ConvertMarkTimes

[ghost]

ConvertMarkTimes() in TraceManagedProcess.cs contains the following code:

if (item.Value.MarkTimes[(int)MarkRootType.MarkOlder] == 0.0)
{
    item.Value.MarkTimes[(int)MarkRootType.MarkOverflow] -= item.Value.MarkTimes[(int)MarkRootType.MarkOlder];
}

If item.Value.MarkTimes[(int)MarkRootType.MarkOlder] == 0.0, then subtracting it should have no effect.

[github-actions[bot]]

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