A typo

V3001 There are identical sub-expressions ‘Left == 0’ to the left and to the right of the ‘&&’ operator. Thickness.cs 29

public double Left   { get; set; }
public double Top    { get; set; }
public double Right  { get; set; }
public double Bottom { get; set; }

internal bool IsDefault
{
  get { return Left == 0 && Top == 0 && Right == 0 && Left == 0; }
}

The subexpression Left == 0 is used twice in the expression. Apparently, that’s a mistake. The code Bottom == 0 should be used instead of the last subexpression, as it is the only property (judging by the logic and the property set) that is not checked in this expression.

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