src/vs/workbench/api/node/extHostOutputService.ts/ExtHostOutputService2/$setVisibleChannel
class ExtHostOutputService2:	override $setVisibleChannel(channelId: string): void {
		if (channelId) {
			const channel = this._channels.get(channelId);
			if (channel) {
				this._visibleChannelDisposable.value = channel.onDidAppend(() => channel.update());
			}
		}
	}