onDidCommitChatSessionItem doesn't work with background chat in view

[roblourens]

onDidCommitChatSessionItem does an editor replace, but if the chat is in the view, it is not replaced. I think this is the reason that the editing session is not restored properly.

[joshspicer]

1. Chat Widget's + button to open a new "blank" cloud session

2. send a message (creating a cloud session).
3. After your request is done, the chat editor should be replaced with the streaming contents from cloud agent

Basically, experience should feel smooth and you shouldn't get 'stuck'