only invalidate shadow when shadow is enabled

gui/src/2D/controls/control.ts

@@ -1118,22 +1118,32 @@ export class Control {
             // the previous measure is used to properly clear a control that is scaled down
             Measure.CombineToRef(this._tmpMeasureA, this._prevCurrentMeasureTransformedIntoGlobalSpace, this._tmpMeasureA);
 
-            // Expand rect based on shadows
-            var shadowOffsetX = this.shadowOffsetX;
-            var shadowOffsetY = this.shadowOffsetY;
-            var shadowBlur = this.shadowBlur;
-
-            var leftShadowOffset = Math.min(Math.min(shadowOffsetX, 0) - shadowBlur * 2, 0);
-            var rightShadowOffset = Math.max(Math.max(shadowOffsetX, 0) + shadowBlur * 2, 0);
-            var topShadowOffset = Math.min(Math.min(shadowOffsetY, 0) - shadowBlur * 2, 0);
-            var bottomShadowOffset = Math.max(Math.max(shadowOffsetY, 0) + shadowBlur * 2, 0);
+            if (this.shadowBlur || this.shadowOffsetX || this.shadowOffsetY) {
+                // Expand rect based on shadows
+                var shadowOffsetX = this.shadowOffsetX;
+                var shadowOffsetY = this.shadowOffsetY;
+                var shadowBlur = this.shadowBlur;
+
+                var leftShadowOffset = Math.min(Math.min(shadowOffsetX, 0) - shadowBlur * 2, 0);
+                var rightShadowOffset = Math.max(Math.max(shadowOffsetX, 0) + shadowBlur * 2, 0);
+                var topShadowOffset = Math.min(Math.min(shadowOffsetY, 0) - shadowBlur * 2, 0);
+                var bottomShadowOffset = Math.max(Math.max(shadowOffsetY, 0) + shadowBlur * 2, 0);
+
+                this.host.invalidateRect(
+                    Math.floor(this._tmpMeasureA.left + leftShadowOffset),
+                    Math.floor(this._tmpMeasureA.top + topShadowOffset),
+                    Math.ceil(this._tmpMeasureA.left + this._tmpMeasureA.width + rightShadowOffset),
+                    Math.ceil(this._tmpMeasureA.top + this._tmpMeasureA.height + bottomShadowOffset),
+                );
+            } else {
+                this.host.invalidateRect(
+                    Math.floor(this._tmpMeasureA.left),
+                    Math.floor(this._tmpMeasureA.top),
+                    Math.ceil(this._tmpMeasureA.left + this._tmpMeasureA.width),
+                    Math.ceil(this._tmpMeasureA.top + this._tmpMeasureA.height),
+                );
+            }
 
-            this.host.invalidateRect(
-                Math.floor(this._tmpMeasureA.left + leftShadowOffset),
-                Math.floor(this._tmpMeasureA.top + topShadowOffset),
-                Math.ceil(this._tmpMeasureA.left + this._tmpMeasureA.width + rightShadowOffset),
-                Math.ceil(this._tmpMeasureA.top + this._tmpMeasureA.height + bottomShadowOffset),
-            );
         }
     }