src/vs/workbench/api/common/extHostWebviewView.ts/ExtHostWebviewView/_setVisible
class ExtHostWebviewView:	/* internal */ _setVisible(visible: boolean) {
		if (visible === this.#isVisible || this.#isDisposed) {
			return;
		}

		this.#isVisible = visible;
		this.#onDidChangeVisibility.fire();
	}