def visit_RemoveItem(self, op):
        container = self.containers.get(op.item)
        if container is None:
            return
        if container.isWindow():
            container.unfloat()
        else:
            container.unplug()
        container.hide()
Handle the RemoveItem dock layout op.
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/docking/layout_builder.py/LayoutBuilder.visit_RemoveItem