By visibility, I'm talking about pipeline.visible, introduced in #10225.

The way it works today is:

• if iframe.setVisibility() is called, all the inner current pipelines are updated
• if a new inner pipeline is created, its visible property is inherited from its parent

This is wrong. This breaks if current pipeline is updated. It should work that way:

• if iframe.setVisibility() is called, all the inner pipelines are updated (not just the current ones)
• if a new inner pipeline is created, its visible property is inherited from the previous pipeline, or if none, from its parent