keep mouse_track behavior all the same as in flutter

Author: zhuxingwei

Runtime/gestures/mouse_tracking.cs

@@ -168,6 +168,19 @@ void exitAllDevices(_TrackedAnnotation trackedAnnotation) {
                 }
 
                 _TrackedAnnotation hitAnnotation = this._findAnnotation(hit);
+                //enter
+                if (!hitAnnotation.activeDevices.Contains(deviceId)) {
+                    hitAnnotation.activeDevices.Add(deviceId);
+                    if (hitAnnotation.annotation?.onEnter != null) {
+                        hitAnnotation.annotation.onEnter(PointerEnterEvent.fromHoverEvent(lastEvent));
+                    }
+                }
+
+                //hover
+                if (hitAnnotation.annotation?.onHover != null) {
+                    hitAnnotation.annotation.onHover(PointerHoverEvent.fromHoverEvent(lastEvent));
+                }
+                
                 //leave
                 foreach (_TrackedAnnotation trackedAnnotation in this._trackedAnnotations.Values) {
                     if (hitAnnotation == trackedAnnotation) {
@@ -182,19 +195,6 @@ void exitAllDevices(_TrackedAnnotation trackedAnnotation) {
                         trackedAnnotation.activeDevices.Remove(deviceId);
                     }
                 }
-                
-                //enter
-                if (!hitAnnotation.activeDevices.Contains(deviceId)) {
-                    hitAnnotation.activeDevices.Add(deviceId);
-                    if (hitAnnotation.annotation?.onEnter != null) {
-                        hitAnnotation.annotation.onEnter(PointerEnterEvent.fromHoverEvent(lastEvent));
-                    }
-                }
-
-                //hover
-                if (hitAnnotation.annotation?.onHover != null) {
-                    hitAnnotation.annotation.onHover(PointerHoverEvent.fromHoverEvent(lastEvent));
-                }
             }
         }
     }