Merged PR 179: Fix bugs about flex and context menu (see desc) + disable hard rigid behavior + add missing properties to form + Clean up css

- Clean up some css class
- Fix wrong order when applying flex
- Fix Replace behavior not working because previous container was still existing
- Disable hard rigid behavior which disallow two container to overlap
- Add ENABLE_FLEX, ENABLE_HARD_RIGID ENABLE_SWAP
- Add missing form properties with dimensions
- Update readme

src/Components/Editor/Actions/ContainerOperations.ts

@@ -276,6 +276,9 @@ export function AddContainers(
       parentClone.children.splice(index, 0, newContainer);
     }
 
+    // Sort the parent children by x
+    UpdateParentChildrenList(parentClone);
+
     /// Handle behaviors here ///
 
     // Initialize default children of the container
@@ -287,9 +290,6 @@ export function AddContainers(
     // Then, apply the behaviors on its siblings (mostly for flex)
     ApplyBehaviorsOnSiblingsChildren(newContainer, current.symbols);
 
-    // Sort the parent children by x
-    UpdateParentChildrenList(parentClone);
-
     // Add to the list of container id for logging purpose
     containerIds.push(newContainer.properties.id);
   });