Additional container when moving a window out of a group

[barkely128]

To reproduce:

1. Create a container, add windows to it, maximize them.
2. Move one of the windows out from it and maximize the window.
3. Move the window back into the container.
4. Repeat step 2

Bug behavior:
Every time the window is moved out and maximized, the container adds another layer.

Expected behavior:
The container should stay as it is, without adding any new layers.

It doesn't always happen, but when it does, by repeating the steps you can have limitless containers within containers.
An example on how it looks: