Ghost box left after removing component

[myungsunscott]

Fantastic addon so far!

I've encountered a strange rendering issue when removing components from the GridStack.

After removing something, the grey box that usually appears when moving the component gets left behind (see image below).

I'm more or less using the sample code from the demo project:

Button btRemove = new Button("Remove");
btRemove.addStyleNames(ValoTheme.BUTTON_TINY, ValoTheme.BUTTON_BORDERLESS_COLORED);
btRemove.addClickListener(re -> gridStack.removeComponent(wrapper));
wrapper.addComponent(btRemove);

@alump have you seen this type of behaviour before? Any tips on how to get rid of it?