Fix ENTER press state;

frontend/mainwindow.cpp

@@ -521,9 +521,11 @@ void MainWindow::keyPressEvent(QKeyEvent *event)
     if (event->key() == Qt::Key_Escape) {
         tryHideMainwindow();
     } else if (event->key() == Qt::Key_Return or event->key() == Qt::Key_Enter) {
+        if (!m_searchResultPage->isHidden()) {
             //显示最佳匹配中第一项的详情页，无搜索结果则调取网页搜索
             qDebug() << "Press Enter";
             m_searchResultPage->pressEnter();
+        }
     } else if (event->key() == Qt::Key_Up) {
         qDebug() << "Press ↑";
         m_searchResultPage->pressUp();

frontend/view/result-view.h

@@ -56,7 +56,6 @@ Q_SIGNALS:
     void listLengthChanged(const int &);
     void rowClicked();
     void lableReset();
-    void mouseSelect(QModelIndex &index);
 };
 
 class ResultWidget : public QWidget