Add intersect to rectangle.

Quik/QuikGeometry.cs

@@ -321,6 +321,14 @@ namespace Quik
             Min += offset;
             Max += offset;
         }
+
+        public static QuikRectangle Intersect(in QuikRectangle a, in QuikRectangle b) =>
+            new QuikRectangle(
+                Math.Min(a.Right, b.Right),
+                Math.Min(a.Top, b.Top),
+                Math.Max(a.Left, b.Left),
+                Math.Max(a.Bottom, b.Bottom)
+            );
     }
 
     /// <summary>