Use QTimer::singleShort

https://doc.qt.io/qt-5/qtimer.html#singleShot-4

QHotkey/qhotkey_x11.cpp

@@ -29,7 +29,6 @@ class QHotkeyPrivateX11 : public QHotkeyPrivate
 private:
 	static const QVector<quint32> specialModifiers;
 	static const quint32 validModsMask;
-	QTimer *releaseTimer = nullptr;
 	xcb_key_press_event_t prevHandledEvent;
 	xcb_key_press_event_t prevEvent;
 
@@ -75,17 +74,11 @@ bool QHotkeyPrivateX11::nativeEventFilter(const QByteArray &eventType, void *mes
 	} else if (genericEvent->response_type == XCB_KEY_RELEASE) {
 		xcb_key_release_event_t keyEvent = *static_cast<xcb_key_release_event_t *>(message);
 		this->prevEvent = keyEvent;
-		auto *timer = new QTimer(this);
-		timer->setSingleShot(true);
-		timer->setInterval(50);
-		connect(timer, &QTimer::timeout, this, [this, keyEvent, timer] {
+		QTimer::singleShot(50, [this, keyEvent] {
 			if(this->prevEvent.time == keyEvent.time && this->prevEvent.response_type == keyEvent.response_type && this->prevEvent.detail == keyEvent.detail){
 				this->releaseShortcut({keyEvent.detail, keyEvent.state & QHotkeyPrivateX11::validModsMask});
 			}
-			delete timer;
 		});
-		timer->start();
-		this->releaseTimer = timer;
 		this->prevHandledEvent = keyEvent;
 	}