Make sure m_DependentDirty is flagged when the strutu change because kExpressionGraphChanged is not send for subgraphs. Cleanup (#121)

Author: iTris666

com.unity.visualeffectgraph/Editor/Models/VFXGraph.cs

@@ -424,11 +424,14 @@ protected override void OnInvalidate(VFXModel model, VFXModel.InvalidationCause
                 UpdateSubAssets();
                 if (model == this)
                     VFXSubgraphContext.CallOnGraphChanged(this);
+
+                m_DependentDirty = true;
             }
 
             if (cause == VFXModel.InvalidationCause.kSettingChanged && model is VFXParameter)
             {
                 VFXSubgraphContext.CallOnGraphChanged(this);
+                m_DependentDirty = true;
             }
 
             if (cause != VFXModel.InvalidationCause.kExpressionInvalidated &&
@@ -753,15 +756,12 @@ public void RecompileIfNeeded(bool preventRecompilation = false, bool preventDep
             }
             if (!preventDependencyRecompilation && m_DependentDirty)
             {
-                if (m_DependentDirty)
+                var obj = GetResource().visualEffectObject;
+                foreach (var graph in GetAllGraphs<VisualEffectAsset>())
                 {
-                    var obj = GetResource().visualEffectObject;
-                    foreach (var graph in GetAllGraphs<VisualEffectAsset>())
-                    {
-                        graph.SubgraphDirty(obj);
-                    }
-                    m_DependentDirty = false;
+                    graph.SubgraphDirty(obj);
                 }
+                m_DependentDirty = false;
             }
         }