src/vs/workbench/contrib/webviewView/browser/webviewViewPane.ts/WebviewViewPane/saveState
class WebviewViewPane:	public override saveState() {
		if (this._webview.value) {
			this.viewState[storageKeys.webviewState] = this._webview.value.state;
		}

		this.memento.saveMemento();
		super.saveState();
	}