UX: Waiting for background command output is duplicated and doesnt collapse/expand

[dileepyavan]

Testing #290583

Repro:

1. Run a long running command in terminal and click on the button to make it as background session.

Expected:

1. On clicking on the title, the below container should expand/collapse.
2. The title is duplicated as shown above.

[Tyriar]

That's the thinking block summary, not sure if we can/should do anything there.