more work on gtk & code cleanup

Pilz.UI.WinForms/DisplayHelp.cs

@@ -1,5 +1,4 @@
-using System.Drawing;
-using System.Drawing.Drawing2D;
+using System.Drawing.Drawing2D;
 
 namespace Pilz.UI.WinForms;
 
@@ -61,9 +60,11 @@ public class DisplayHelp
         else
         {
             using var brush = CreateLinearGradientBrush(r, color1, color2, gradientAngle);
-            var blend = new Blend(factors.Length);
-            blend.Factors = factors;
-            blend.Positions = positions;
+            var blend = new Blend(factors.Length)
+            {
+                Factors = factors,
+                Positions = positions
+            };
             brush.Blend = blend;
             g.FillRectangle(brush, r);
         }