[VFX] Profiling window / panels fixes

Author: ludovic-theobald

Packages/com.unity.visualeffectgraph/Editor/GraphView/Profiling/VFXProfilingBoard.cs

@@ -394,7 +394,7 @@ private void CreateOrResumeUpdateItems()
 
         void Update()
         {
-            if (m_AttachedComponent == null)
+            if (m_AttachedComponent == null || m_AttachedComponent.visualEffectAsset == null)
             {
                 Detach();
                 return;

Packages/com.unity.visualeffectgraph/Editor/GraphView/Profiling/VFXSystemProfilerUI.cs

@@ -13,7 +13,11 @@ public VFXSystemProfilerUI(VFXContextUI initContextUI, List<VFXContextProfilerUI
 
             controller = initContextUI.controller;
             controller.RegisterHandler(this);
-            ScheduleRepositionInitializePanel();
+            RegisterCallback<GeometryChangedEvent, VFXContextProfilerUI>((e, contextPanel) =>
+            {
+                contextPanel.SetVerticalOffset(e.newRect.height);
+                contextPanel.RepositionPanel();
+            }, m_SystemContexts[0]);
 
             VFXSystemNames systemNames = controller.viewController.graph.systemNames;
             string systemName = systemNames.GetUniqueSystemName(controller.model.GetData());
@@ -70,20 +74,6 @@ public string GetSystemName()
             return m_SystemName;
         }
 
-        void ScheduleRepositionInitializePanel()
-        {
-            schedule.Execute(() =>
-            {
-                m_SystemContexts[0].SetVerticalOffset(resolvedStyle.height);
-                m_SystemContexts[0].RepositionPanel();
-            });
-        }
-        protected override void OnCollapseChanged(ChangeEvent<bool> evt)
-        {
-            base.OnCollapseChanged(evt);
-            ScheduleRepositionInitializePanel();
-        }
-
         void AddStatusSection()
         {
             VisualElement statusContainer = new VisualElement