Nodes are not changing position after setting its loc property

@Diyajohnc wrote:

We are having an angular application and we are using diagram as directive.
In the diagram we have two templates

diagram.nodeTemplateMap.add("texteditor",
GO(go.Node, "Spot",
new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
GO(go.TextBlock,
{
margin : 5,
maxSize: new go.Size(280, NaN),
width: 280,
textAlign: 'left',
name:'ParentText',
alignment: go.Spot.Bottom,
editable: true,
isMultiline: true

			                         },
									 new go.Binding("text").makeTwoWay(),
									 new go.Binding("font", "font").makeTwoWay(),
									 new go.Binding("stroke", "stroke").makeTwoWay(),
									 new go.Binding("background", "lightgreen"))
									));

		    diagram.nodeTemplateMap.add("memoPicture",
		       GO(go.Node, "Spot",
		    		new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
		          GO(go.Panel, "Horizontal",
		            GO(go.Picture,
		              {
		                name: "Picture",
		                maxSize: new go.Size(250, 250),
		                margin: new go.Margin(5, 5, 5, 5),
		              },
		              new go.Binding("source", "source"))
		            )
		          )
		        );

In the text edited event of textblock, we are trying to move the picture node to some other position using

$scope.model.startTransaction("ChangeLoc");
$scope.model.setDataProperty(imageNode.data, 'loc', locPosition);
$scope.model.commitTransaction("ChangeLoc");
It is changing the position only in the second event. Can you please help us in this regard.

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