Fixed issue where dragging would not save new position

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/COPIED/SelectionDragger.cs

+using System;
+using System.Linq;
+using RMGUI.GraphView;
+using UnityEngine;
+using UnityEngine.RMGUI;
+
+namespace UnityEditor.Graphing.Drawing
+{
+	public class SelectionDragger : Dragger
+	{
+
+
+		public SelectionDragger()
+		{
+			activateButton = MouseButton.LeftMouse;
+			activateModifiers = KeyModifiers.None;
+			panSpeed = new Vector2(1, 1);
+			clampToParentEdges = false;
+		}
+
+		public override EventPropagation HandleEvent(Event evt, VisualElement finalTarget)
+		{
+			if (finalTarget == target && !this.HasCapture())
+				return EventPropagation.Continue;
+
+			var graphView = target as GraphView;
+			if (graphView == null)
+			{
+				throw new InvalidOperationException("Manipulator can only be added to a GraphView");
+			}
+
+			switch (evt.type)
+			{
+				case EventType.MouseDown:
+					if (CanStartManipulation(evt))
+					{
+						// avoid starting a manipulation on a non movable object
+						var ce = finalTarget as GraphElement;
+						if (ce == null)
+						{
+							ce = finalTarget.GetFirstAncestorOfType<GraphElement>();
+							if (ce == null)
+								return EventPropagation.Continue;
+						}
+
+						GraphElementData data = ce.dataProvider;
+						if (data != null && ((ce.dataProvider.capabilities & Capabilities.Movable) != Capabilities.Movable))
+							return EventPropagation.Continue;
+
+						this.TakeCapture();
+						return EventPropagation.Stop;
+					}
+					break;
+
+				case EventType.MouseDrag:
+					if (this.HasCapture())
+					{
+						foreach (ISelectable s in graphView.selection)
+						{
+							GraphElement ce = s as GraphElement;
+							if (ce == null || ce.dataProvider == null)
+								continue;
+
+							GraphElementData data = ce.dataProvider;
+							if ((ce.dataProvider.capabilities & Capabilities.Movable) != Capabilities.Movable)
+								continue;
+
+							Matrix4x4 g = ce.globalTransform;
+							var scale = new Vector3(g.m00, g.m11, g.m22);
+
+							data.position = CalculatePosition(data.position.x + evt.delta.x * panSpeed.x / scale.x,
+																data.position.y + evt.delta.y * panSpeed.y / scale.y,
+																data.position.width, data.position.height);
+						}
+
+						return EventPropagation.Stop;
+					}
+					break;
+
+				case EventType.MouseUp:
+					if (CanStopManipulation(evt))
+					{
+					    foreach (var s in graphView.selection.OfType<GraphElement>())
+					    {
+					        if (s.dataProvider == null)
+					            continue;
+
+					        var node = s.dataProvider as NodeDrawData;
+					        if (node != null)
+					            node.CommitChanges();
+					    }
+					    this.ReleaseCapture();
+					    return EventPropagation.Stop;
+					}
+					break;
+			}
+			return EventPropagation.Continue;
+		}
+	}
+}