fix: 修复下载按钮点击/双击/拖动时，主窗口动作与下载管理对话框动作同时触发问题

下载按钮未屏蔽双击事件，导致触发主窗口最大化动作，同时下载对话框显示在原始位置；拖动时触发下载对话框显示，移动时又隐藏下载对话框，造成闪烁现象；重复点击下载按钮，对话框闪烁

Log: 修改下载按钮和下载对话框焦点策略对象，保证对话框焦点状态与下载按钮同步；对话框显示操作移入下载按钮鼠标事件中处理，隐藏操作移入主窗口事件循环中判断，当主窗口/下载对话框均不是活动窗口时隐藏对话框

* 可能修复 ISSUE #I6FNOW，目前修改后，连续点击下载按钮，对话框将按顺序显示/隐藏

src/mainwindow-dtk.cpp

@@ -132,6 +132,9 @@ void MainWindow::initTitleBar()
     searchEdit->setPlaceholderText(tr("Search or enter spk://"));
 
     downloadButton = new ProgressButton(ui->titlebar);
+    downloadButton->setDownloadListWidget(downloadlistwidget);
+    downloadButton->setFocusPolicy(Qt::FocusPolicy::ClickFocus);
+    downloadlistwidget->setFocusProxy(downloadButton);
 
     QWidget *w_titlebar = new QWidget(ui->titlebar);
     QHBoxLayout *ly_titlebar = new QHBoxLayout(w_titlebar);
@@ -297,14 +300,6 @@ void MainWindow::initConnections()
         ui->appintopage->setTheme(themeType == DGuiApplicationHelper::DarkType);
         ui->settingspage->setTheme(themeType == DGuiApplicationHelper::DarkType); });
 
-    connect(downloadButton, &ProgressButton::clicked, [=]()
-            {
-        QPoint pos;
-        pos.setX(downloadButton->mapToGlobal(QPoint(0, 0)).x() + downloadButton->width() / 2 - downloadlistwidget->width() / 2);
-        pos.setY(downloadButton->mapToGlobal(QPoint(0, 0)).y() + downloadButton->height() + 5);
-        downloadlistwidget->m_move(pos.x(), pos.y());
-        downloadlistwidget->show(); });
-
     // appintopage按下下载按钮时标题栏下载列表按钮抖动
     connect(ui->appintopage, &AppIntoPage::clickedDownloadBtn, [=]()
             {
@@ -421,6 +416,34 @@ void MainWindow::updateUi(int now)
     switchPage(AppPageApplist);
 }
 
+void MainWindow::notify(QObject *receiver, QEvent *event)
+{
+    if (!receiver) {
+        return;
+    }
+
+    Dtk::Widget::DStyle *o_ptr = qobject_cast<Dtk::Widget::DStyle *>(receiver);
+    if (o_ptr) {
+        return;
+    }
+
+    if (receiver->inherits("QWidgetWindow")) {
+        return;
+    }
+
+    if (event->type() == QEvent::FocusIn) {
+        QList<QObject *> list = downloadButton->findChildren<QObject *>(QString(), Qt::FindChildrenRecursively);
+        list << downloadlistwidget->findChildren<QObject *>(QString(), Qt::FindChildrenRecursively);
+        if (receiver != downloadButton && receiver != downloadlistwidget && !list.contains(receiver)) {
+            downloadlistwidget->hide();
+        }
+    } else if (event->type() == QEvent::FocusOut) {
+        if (!downloadlistwidget->isActiveWindow() && !isActiveWindow()) {
+            downloadlistwidget->hide();
+        }
+    }
+}
+
 void MainWindow::on_pushButton_14_clicked()
 {
     // Check UOS