Extension API request: vscode.Terminal.onBufferChange

[ArkaneMoose]

Hello, I'd like to request a new extension API:

vscode.Terminal.onBufferChange: vscode.Event<'normal' | 'alternate'>

This would expose the existing Xterm.js event Terminal.buffer.onBufferChange: IEvent<IBuffer>.
The event parameter 'normal' | 'alternate' would come from the type property of the IBuffer passed to the Xterm.js event callback.

I'd like to use such an API to implement a small extension that maximizes the VS Code integrated terminal when it switches to the alternate buffer and restores it when it switches back to the normal one (by invoking the workbench.action.toggleMaximizedPanel command). I previously discussed this idea at microsoft/vscode-discussions#322.

Thanks!

[Tyriar]

We may add an event like this as part of the buffer API: #207504

So closing in favor of that.

/duplicate