[Bug] [DrawingView] [Android] clear lines not working

[circa94]

Description

When clearing the DrawingView on Android, the lines are still visible until a new drawing has started. Only then previous lines will be removed.

Steps to Reproduce

1. Open Android Sample App
2. Open DrawingView Sample
3. Draw some lines
4. Click "DISPLAY HIDDEN LABELS"
5. Click "CLEAR ALL LINES"

Expected Behavior

Drawn lines should be removed.

Actual Behavior

Lines are still visible.

Basic Information

• Version with issue: 1.3.0-pre2
• IDE: VS 2019 16.11.2
• Platform Target Frameworks:
  • Android: 11.0

[circa94]

I was able to fix this issue by call Invalidate() not only when lines.Count > 0

DrawingViewRender.android.cs

void LoadLines()
{
	drawCanvas!.DrawColor(Element.BackgroundColor.ToAndroid(), PorterDuff.Mode.Clear!);
	drawPath.Reset();
	var lines = Element.Lines;
	if (lines.Count > 0)
	{
		foreach (var line in lines)
		{
			drawPath.MoveTo((float)line.Points[0].X, (float)line.Points[0].Y);
			foreach (var (x, y) in line.Points)
				drawPath.LineTo((float)x, (float)y);

			drawCanvas.DrawPath(drawPath, drawPaint);
			drawPath.Reset();
		}	
	}
	Invalidate();
}

Please let me know if I can create a PR for that fix.