[2640] Compute handle position on diagram conversion

Bug: #2640
Signed-off-by: Guillaume Coutable <guillaume.coutable@obeo.fr>

CHANGELOG.adoc

@@ -123,6 +123,7 @@ It uses our algorithm instead of elk.js to perform the arrange-all.
 - https://github.com/eclipse-sirius/sirius-web/issues/2635[#2635] [diagram] Fix an error when switching between react flow representations.
 - https://github.com/eclipse-sirius/sirius-web/issues/2581[#2581] [diagram] Fix an issue where nodes created by custom tool are always on the default position.
 - https://github.com/eclipse-sirius/sirius-web/issues/2642[#2642] [diagram] Fix an issue where moving the viewport was slow.
+- https://github.com/eclipse-sirius/sirius-web/issues/2640[#2640] [diagram] Compute the handle position on diagram conversion, which happens every time a diagram refresh payload is received.
 
 === New Features
 

packages/diagrams/frontend/sirius-components-diagrams-reactflow/src/converter/convertDiagram.ts

@@ -18,6 +18,8 @@ import { GQLLabel, GQLLabelStyle } from '../graphql/subscription/labelFragment.t
 import { GQLNode, GQLNodeStyle, GQLViewModifier } from '../graphql/subscription/nodeFragment.types';
 import { Diagram, Label, NodeData } from '../renderer/DiagramRenderer.types';
 import { MultiLabelEdgeData } from '../renderer/edge/MultiLabelEdge.types';
+import { RawDiagram } from '../renderer/layout/layout.types';
+import { layoutHandles } from '../renderer/layout/layoutHandles';
 import { DiagramNodeType } from '../renderer/node/NodeTypes.types';
 import { IConvertEngine, INodeConverterHandler } from './ConvertEngine.types';
 import { IconLabelNodeConverterHandler } from './IconLabelNodeConverterHandler';
@@ -211,14 +213,20 @@ export const convertDiagram = (
     };
   });
 
+  const rawDiagram: RawDiagram = {
+    nodes,
+    edges,
+  };
+  layoutHandles(rawDiagram);
+
   return {
     metadata: {
       id: gqlDiagram.id,
       label: gqlDiagram.metadata.label,
       kind: gqlDiagram.metadata.kind,
       targetObjectId: gqlDiagram.targetObjectId,
     },
-    nodes,
-    edges,
+    nodes: rawDiagram.nodes,
+    edges: rawDiagram.edges,
   };
 };