src/vs/workbench/api/common/extHostWebviewPanels.ts/ExtHostWebviewPanel/dispose
class ExtHostWebviewPanel:	public override dispose() {
		if (this.#isDisposed) {
			return;
		}

		this.#isDisposed = true;
		this.#onDidDispose.fire();

		this.#proxy.$disposeWebview(this.#handle);
		this.#webview.dispose();

		super.dispose();
	}