The color of a path will change if approximated

[dsn27]

Steps to reproduce:

Select a path and run approximate

ColorChange.mp4

[dsn27]

The ColorDef will not be overwritte as it is not null

CADability/CADability/Path.cs

Lines 2242 to 2258 in 854c8eb

	void IColorDef.SetTopLevel(ColorDef newValue, bool overwriteChildNullColor)
	{
	(this as IColorDef).SetTopLevel(newValue);
	if (overwriteChildNullColor)
	{
	if (subCurves != null)
	{
	for (int i = 0; i < subCurves.Length; ++i)
	{
	if ((subCurves[i] as IColorDef).ColorDef == null)
	{
	(subCurves[i] as IColorDef).ColorDef = newValue;
	}
	}
	}
	}
	}