revert lines to be middle of pixel based so drawline aligns with draw…

…rectangle

Added unit tests for drawline overlapping.

src/Consolonia.Core/Drawing/DrawingContextImpl.cs

@@ -304,35 +304,25 @@ private void DrawLineInternal(IPen pen, Line line)
         {
             if (pen.Thickness == 0) return;
 
-            line = TransformLineInternal(line);
-
-            Point head = line.PStart;
-            if (pen.Brush is MoveConsoleCaretToPositionBrush)
+            if (pen.Thickness == UnderlineThickness || pen.Thickness == StrikethroughThickness)
             {
-                CurrentClip.ExecuteWithClipping(head,
-                    () => { _pixelBuffer.Set((PixelBufferCoordinate)head, pixel => pixel.Blend(new Pixel(true))); });
-                return;
-            }
+                if (line.Vertical)
+                    throw new NotSupportedException("Vertical strikethrough or underline text decorations is not supported.");
 
-            if (line.Vertical == false && pen.Thickness > 2)
-            {
                 // horizontal lines with thickness larger than one are text decorations
-                ApplyTextDecorationLineInternal(ref head, pen, line);
+                ApplyTextDecorationLineInternal(pen, line);
                 return;
             }
 
-            var extractColorCheckPlatformSupported = ExtractColorOrNullWithPlatformCheck(pen, out var lineStyle);
-            if (extractColorCheckPlatformSupported == null)
-                return;
-
-            var color = (Color)extractColorCheckPlatformSupported;
-
-            byte pattern = (byte)(line.Vertical ? 0b1010 : 0b0101);
-            DrawPixelAndMoveHead(ref head, line, lineStyle, pattern, color, line.Length); //line
+            DrawRectangleLineInternal(pen, line);
         }
 
-        private void ApplyTextDecorationLineInternal(ref Point head, IPen pen, Line line)
+        private void ApplyTextDecorationLineInternal(IPen pen, Line line)
         {
+            line = TransformLineInternal(line);
+
+            Point head = line.PStart;
+
             TextDecorationLocation textDecoration = pen.Thickness switch
             {
                 UnderlineThickness => TextDecorationLocation.Underline,