fix: joystick handleSource not enabled for flutter runtime

Fixes rive-app#331

An inconsistency between the editor and Flutter runtime. External control on a Joystick was not applied.

I used this file to reproduce and test: [joystickdemo2.rev.zip](https://github.com/rive-app/rive/files/12051102/joystickdemo2.rev.zip)

Expected behaviour (the handle is controlled by the position of the top rectangle):

https://github.com/rive-app/rive/assets/13705472/1eae3a71-5f2d-4375-a531-d36b61e5cc61

Diffs=
44f6c4b9c fix: joystick handleSource not enabled for flutter runtime (#5589)
d1f8710f5 Fix dependency order issues for Follow Path (#5595)

Co-authored-by: Gordon <pggordonhayes@gmail.com>

lib/src/rive_core/artboard.dart

@@ -218,9 +218,9 @@ class Artboard extends ArtboardBase with ShapePaintContainer {
 
     // If joysticks applied, run the update again for the animation changes.
     if (!canApplyJoysticksEarly && applyJoysticks()) {
-      updateComponents();
-
-      didUpdate = true;
+      if (updateComponents()) {
+        didUpdate = true;
+      }
     }
 
     if (nested) {

lib/src/rive_core/joystick.dart

@@ -30,13 +30,10 @@ class Joystick extends JoystickBase {
     if (dirt & (ComponentDirt.transform | ComponentDirt.worldTransform) != 0) {
       _worldTransform = computeWorldTransform();
       Mat2D.invert(_inverseWorldTransform, _worldTransform);
-      if (handleSource != null) {
+      if (isComplex) {
         var pos = _inverseWorldTransform * handleSource!.worldTranslation;
         var local = localBounds.factorFrom(pos);
 
-        // In the editor we don't want to notify changes while we're in the
-        // update cycle.
-
         x = local.x;
         y = local.y;
       }
@@ -96,6 +93,13 @@ class Joystick extends JoystickBase {
     context.markNeedsAdvance();
   }
 
+  @override
+  void buildDependencies() {
+    super.buildDependencies();
+    parent?.addDependent(this);
+    handleSource?.addDependent(this);
+  }
+
   Vec2D get position => Vec2D.fromValues(posX, posY);
   Mat2D _worldTransform = Mat2D();
   final Mat2D _inverseWorldTransform = Mat2D();
@@ -170,6 +174,13 @@ class Joystick extends JoystickBase {
     }
   }
 
+  @override
+  void onAddedDirty() {
+    super.onAddedDirty();
+
+    handleSource = context.resolve(handleSourceId);
+  }
+
   void _transformChanged() {
     markTransformDirty();
   }