docs: set node front when embeded (#694)

examples/x6-app-draw/src/pages/Graph/index.ts

@@ -33,6 +33,7 @@ export default class FlowGraph {
         rubberband: true,
         movable: true,
         showNodeSelectionBox: true,
+        filter: ['groupNode'],
       },
       connecting: {
         anchor: 'center',
@@ -346,6 +347,12 @@ export default class FlowGraph {
       })
     })
 
+    graph.on('node:embedded', ({ cell }) => {
+      if (cell.shape !== 'groupNode') {
+        cell.toFront()
+      }
+    })
+
     graph.bindKey('backspace', () => {
       const cells = graph.getSelectedCells()
       if (cells.length) {