Limit interaction of layers in containers

[goatley1]

Containers are a great feature.  They allow us to create larger workflows in smaller canvases, and manage the flow and appearance of our work.  However the design whether intentional or flawed that allows the container window to interact with the layers behind it is annoying.  Connection wires should not redirect within a container because of things on the canvas behind the container.  Likewise if I have a container open, I should not be able to grab a tool or container behind the open container through the container canvas.  Please fix this flaw.