src/vs/workbench/contrib/webview/electron-sandbox/webviewElement.ts/ElectronWebviewElement/handleFocusChange
class ElectronWebviewElement:	protected override handleFocusChange(isFocused: boolean): void {
		super.handleFocusChange(isFocused);
		if (isFocused) {
			this._webviewKeyboardHandler.didFocus();
		} else {
			this._webviewKeyboardHandler.didBlur();
		}
	}