Fix issue where node inputs would misalign from their ports

com.unity.shadergraph/CHANGELOG.md

@@ -94,6 +94,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed a bug where instanced shaders wouldn't compile on PS4.
 - Optimized loading a large Shader Graph. [1209047](https://issuetracker.unity3d.com/issues/shader-graph-unresponsive-editor-when-using-large-graphs)
 - Fixed NaN issue in triplanar SG node when blend goes to 0.
+- Fixed a recurring bug where node inputs would get misaligned from their ports. [1224480]
 
 ## [7.1.1] - 2019-09-05
 ### Added

com.unity.shadergraph/Editor/Data/Nodes/Utility/RedirectNodeView.cs

@@ -129,6 +129,12 @@ public void OnModified(ModificationScope scope)
             }
         }
 
+        public bool FindPort(SlotReference slot, out ShaderPort port)
+        {
+            port = contentContainer.Q("top")?.Query<ShaderPort>().Where(p => p.slot.slotReference.Equals(slot)).First();
+            return port != null;
+        }
+
         public void AttachMessage(string errString, ShaderCompilerMessageSeverity severity)
         {
             ClearMessage();

com.unity.shadergraph/Editor/Drawing/Views/GraphEditorView.cs

@@ -787,14 +787,11 @@ void AddNode(AbstractMaterialNode node)
             if (m_SearchWindowProvider.nodeNeedsRepositioning && m_SearchWindowProvider.targetSlotReference.nodeGuid.Equals(node.guid))
             {
                 m_SearchWindowProvider.nodeNeedsRepositioning = false;
-                foreach (var element in nodeView.inputContainer.Children().Union(nodeView.outputContainer.Children()))
+                if (nodeView is IShaderNodeView shaderView &&
+                    shaderView.FindPort(m_SearchWindowProvider.targetSlotReference, out var port))
                 {
-                    var port = (ShaderPort)element;
-                    if (port.slot.slotReference.Equals(m_SearchWindowProvider.targetSlotReference))
-                    {
-                        port.RegisterCallback<GeometryChangedEvent>(RepositionNode);
-                        return;
-                    }
+                    port.RegisterCallback<GeometryChangedEvent>(RepositionNode);
+                    return;
                 }
             }
 
@@ -897,10 +894,11 @@ Edge AddEdge(IEdge edge)
             var sourceNodeView = m_GraphView.nodes.ToList().OfType<IShaderNodeView>().FirstOrDefault(x => x.node == sourceNode);
             if (sourceNodeView != null)
             {
-                var sourceAnchor = sourceNodeView.gvNode.outputContainer.Children().OfType<ShaderPort>().First(x => x.slot.Equals(sourceSlot));
+                sourceNodeView.FindPort(sourceSlot.slotReference, out var sourceAnchor);
 
                 var targetNodeView = m_GraphView.nodes.ToList().OfType<IShaderNodeView>().First(x => x.node == targetNode);
-                var targetAnchor = targetNodeView.gvNode.inputContainer.Children().OfType<ShaderPort>().First(x => x.slot.Equals(targetSlot));
+
+                targetNodeView.FindPort(targetSlot.slotReference, out var targetAnchor);
 
                 var edgeView = new Edge
                 {
@@ -969,7 +967,7 @@ void UpdateEdgeColors(HashSet<IShaderNodeView> nodeViews)
                     }
                 }
 
-                foreach (var anchorView in nodeView.inputContainer.Children().OfType<Port>())
+                foreach (var anchorView in nodeView.inputContainer.Query<Port>().ToList())
                 {
                     var targetSlot = anchorView.GetSlot();
                     if (targetSlot.valueType != SlotValueType.DynamicVector)

com.unity.shadergraph/Editor/Drawing/Views/IShaderNodeView.cs

@@ -2,6 +2,7 @@
 using UnityEditor.Experimental.GraphView;
 using UnityEditor.Graphing;
 using UnityEditor.Rendering;
+using UnityEditor.ShaderGraph.Drawing;
 using UnityEngine;
 using UnityEngine.UIElements;
 
@@ -18,5 +19,8 @@ interface IShaderNodeView : IDisposable
         void OnModified(ModificationScope scope);
         void AttachMessage(string errString, ShaderCompilerMessageSeverity severity);
         void ClearMessage();
+        // Searches the ports on this node for one that matches the given slot.
+        // Returns true if found, false if not.
+        bool FindPort(SlotReference slot, out ShaderPort port);
     }
 }