SD-1592: DottedLineMargin got same color as line numbers

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/DottedLineMargin.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Windows;
+using System.Windows.Data;
 using System.Windows.Media;
 using System.Windows.Shapes;
 
@@ -19,18 +20,24 @@ namespace ICSharpCode.AvalonEdit.Editing
 		/// <summary>
 		/// Creates a vertical dotted line to separate the line numbers from the text view.
 		/// </summary>
-		public static UIElement Create()
+		public static UIElement Create(TextEditor editor)
 		{
-			return new Line {
+			Line line = new Line {
 				X1 = 0, Y1 = 0, X2 = 0, Y2 = 1,
 				StrokeDashArray = { 0, 2 },
 				Stretch = Stretch.Fill,
-				Stroke = Brushes.Gray,
 				StrokeThickness = 1,
 				StrokeDashCap = PenLineCap.Round,
 				Margin = new Thickness(2, 0, 2, 0),
 				Tag = tag
 			};
+			
+			line.SetBinding(
+				Line.StrokeProperty,
+				new Binding("LineNumbersForeground") { Source = editor }
+			);
+			
+			return line;
 		}
 		
 		/// <summary>

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/TextEditor.cs

@@ -470,9 +470,13 @@ namespace ICSharpCode.AvalonEdit
 			TextEditor editor = (TextEditor)d;
 			var leftMargins = editor.TextArea.LeftMargins;
 			if ((bool)e.NewValue) {
-				leftMargins.Insert(0, new LineNumberMargin());
-				leftMargins.Insert(1, DottedLineMargin.Create());
-				leftMargins[0].SetValue(Control.ForegroundProperty, editor.LineNumbersForeground);
+				var lineNumbers = new LineNumberMargin();
+				leftMargins.Insert(0, lineNumbers);
+				leftMargins.Insert(1, DottedLineMargin.Create(editor));
+				lineNumbers.SetBinding(Control.ForegroundProperty,
+				                       new Binding("LineNumbersForeground") {
+				                       	Source = editor
+				                       });
 			} else {
 				for (int i = 0; i < leftMargins.Count; i++) {
 					if (leftMargins[i] is LineNumberMargin) {