Function getxhroverHandler

Picviewer CE+/dist.user.js:16055–16058

                            self.showTips("Sending request...", 3000);
                            await new Promise((resolve) => {
                                let getxhroverHandler = e => {
                                    conItem.removeEventListener('getxhrover', getxhroverHandler);
                                    resolve();
                                };
                                conItem.addEventListener('getxhrover', getxhroverHandler);
                                conItem.dispatchEvent(new Event('getxhr'));
                            });