修复搜索一次后隐藏界面再次唤醒会闪一下的问题

frontend/mainwindow.cpp

@@ -368,10 +368,11 @@ bool MainWindow::tryHideMainwindow()
     if (!m_isAskDialogVisible && QApplication::activeModalWidget() == nullptr) {
         qDebug()<<"Mainwindow will be hidden";
         m_currentSearchAsked = false;
-        this->hide();
         m_askTimer->stop();
         m_researchTimer->stop();
         Q_EMIT m_searchResultPage->stopSearch();
+        this->clearSearchResult();
+        this->hide();
         return true;
     } else {
         //有上层弹窗未关闭，不允许隐藏主界面