feat(modeling): support morphing to AdhocSubprocess

lib/features/modeling/behavior/SubProcessPlaneBehavior.js

@@ -95,6 +95,34 @@ export default function SubProcessPlaneBehavior(
   }, true);
 
 
+  this.preExecuted('shape.replace', function(context) {
+    var oldShape = context.oldShape;
+    var newShape = context.newShape;
+
+    if (!isCollapsedSubProcess(oldShape) || !isCollapsedSubProcess(newShape)) {
+      return;
+    }
+
+    // old plane could have content,
+    // we remove it so it is not recursively deleted from 'shape.delete'
+    context.oldRoot = canvas.removeRootElement(planeId(oldShape));
+  }, true);
+
+
+  this.postExecuted('shape.replace', function(context) {
+    var newShape = context.newShape,
+        source = context.oldRoot,
+        target = canvas.findRoot(planeId(newShape));
+
+    if (!source || !target) {
+      return;
+    }
+    var elements = source.children;
+
+    modeling.moveElements(elements, { x: 0, y: 0 }, target);
+  }, true);
+
+
   // rename secondary elements (roots) when the primary element changes
   // this ensures rootElement.id = element.id + '_plane'
   this.executed('element.updateProperties', function(context) {