Cleanup.

Runtime/ui/geometry.cs

         }
 
         public float margin {
-            get { return this.width * this.height; }
+            get { return this.width + this.height; }
         }
 
         public static readonly Rect zero = new Rect(0, 0, 0, 0);

Runtime/ui/painting/draw_cmd.cs

-using UnityEngine;
-
-namespace Unity.UIWidgets.ui {
+namespace Unity.UIWidgets.ui {
     public abstract class DrawCmd {
         public abstract uiRect bounds(float margin);
     }

Runtime/ui/renderer/cmdbufferCanvas/rendering/canvas_impl.cs

                         break;
                     }
 
-                    case DrawImage cmd: {this._drawImage(cmd.image, (uiOffset.fromOffset(cmd.offset)).Value,
+                    case DrawImage cmd: {
+                        this._drawImage(cmd.image, (uiOffset.fromOffset(cmd.offset)).Value,
                             uiPaint.fromPaint(cmd.paint));
                         break;
                     }