Agents: Persist sub-session being open when I reopen chat

[bamurtaugh]

• Select an existing session A
• + within it to create a sub-session
• Kick off message as sub-session
• While that sub-session works, I click into other sessions from my list
• I go back to session A, expecting its sub-session to open up in focus (since that was the last thing I had open)
• ❓ The main content of session A opens, rather than the sub-session. Should we instead persist the last tab the user had open (so a sub-session in my case)?

[lostintangent]

Yeah agreed that this would be a nice QoL improvement.

[benibenj]

Yep, this used to work, but seems to have regressed.