tested consraint to move the opened body, not very satisfying

src/components/MapConcernements.vue

@@ -105,6 +105,7 @@ export default {
     },
     onClick (e) {
       console.log('onClick', this, e);
+      // get the clicked element from matter
       const query = Matter.Query.point(Matter.Composite.allBodies(this.world), this.mouse.position)
       // console.log(this.mouse.position);
       // console.log(query);
@@ -113,7 +114,6 @@ export default {
         // console.log('body id:', elmt.id);
         clickedIDs.push(elmt.id);
       });
-      let opend
       this.concernements.forEach((concernement, index) => {
         this.openCloseConcernement(concernement.id, clickedIDs.indexOf(concernement.id) !== -1)
       });