Improved fix #40 to avoid changes in behaviour of GetPrevCaretPosition()

Author: nippur72

ICSharpCode.AvalonEdit/Editing/CaretNavigationCommandHandler.cs

@@ -213,6 +213,9 @@ internal static TextViewPosition GetNewCaretPosition(TextView textView, TextView
 			switch (direction) {
 				case CaretMovementType.CharLeft:
 					desiredXPos = double.NaN;
+					// do not move caret to previous line in virtual space
+					if (caretPosition.VisualColumn == 0 && enableVirtualSpace)
+						return caretPosition;
 					return GetPrevCaretPosition(textView, caretPosition, visualLine, CaretPositioningMode.Normal, enableVirtualSpace);
 				case CaretMovementType.Backspace:
 					desiredXPos = double.NaN;
@@ -295,8 +298,6 @@ static TextViewPosition GetPrevCaretPosition(TextView textView, TextViewPosition
 			if (pos >= 0) {
 				return visualLine.GetTextViewPosition(pos);
 			} else {
-				if(enableVirtualSpace && mode == CaretPositioningMode.Normal) 
-					return caretPosition;
 				// move to end of previous line
 				DocumentLine previousDocumentLine = visualLine.FirstDocumentLine.PreviousLine;
 				if (previousDocumentLine != null) {