src/vs/workbench/contrib/terminal/browser/remotePty.ts/RemotePty/acknowledgeDataEvent
class RemotePty:	acknowledgeDataEvent(charCount: number): void {
		// Support flow control for server spawned processes
		if (this._inReplay) {
			return;
		}

		this._startBarrier.wait().then(_ => {
			this._remoteTerminalChannel.acknowledgeDataEvent(this._id, charCount);
		});
	}