Implement anchor and fix bugs with rigid body (#27)

Co-authored-by: Eric NGUYEN <enguyen@techform.fr>
Reviewed-on: https://git.siklos-chaneru.duckdns.org/Siklos/svg-layout-designer-react/pulls/27

src/Components/Editor/ContainerOperations.ts

@@ -4,6 +4,7 @@ import { IConfiguration } from '../../Interfaces/IConfiguration';
 import { ContainerModel, IContainerModel } from '../../Interfaces/IContainerModel';
 import { findContainerById } from '../../utils/itertools';
 import { getCurrentHistory } from './Editor';
+import IProperties from '../../Interfaces/IProperties';
 
 /**
  * Select a container
@@ -203,20 +204,23 @@ export function AddContainer(
     }
   }
 
+  const defaultProperties: IProperties = {
+    id: `${type}-${count}`,
+    parentId: parentClone.properties.id,
+    x,
+    y: 0,
+    width: properties.Width,
+    height: parentClone.properties.height,
+    isRigidBody: false,
+    isAnchor: false,
+    XPositionReference: properties.XPositionReference,
+    ...properties.Style
+  };
+
   // Create the container
   const newContainer = new ContainerModel(
     parentClone,
-    {
-      id: `${type}-${count}`,
-      parentId: parentClone.properties.id,
-      x,
-      y: 0,
-      width: properties?.Width,
-      height: parentClone.properties.height,
-      isRigidBody: false,
-      XPositionReference: properties.XPositionReference,
-      ...properties.Style
-    },
+    defaultProperties,
     [],
     {
       type