LessCss.StyleDocument.Merge C# (CSharp) Method

		public StyleDocument Merge()
		{
			var doc = MemberwiseClone() as StyleDocument;
			var newRules = new List<StyleRule>();
			foreach (var selectorGroup in doc.Rules.GroupBy(r => r.GetSelector()))
			{
				var rule = new StyleRule();
				rule.Selectors.Add(new StyleSelector { Name = selectorGroup.Key });
				rule.Properties.AddRange(selectorGroup.SelectMany(r => r.Properties).Distinct());
				if(rule.Properties.Count > 0)
					newRules.Add(rule);
			}

			doc.Rules = GroupRules(newRules).ToList();

			return doc;
		}