fix: fix crash when closing folder list widget

The crash occurred when the folder list widget was being destroyed while
CrumbBar was already deleted. This fix includes:

1. Add weak pointer to CrumbBar to avoid accessing deleted object
2. Move popup visible state update to folder list widget's hidden signal
3. Clean up folder list widget in UrlPushButton's destructor

Log: This ensures proper cleanup of resources and prevents accessing deleted objects.

src/plugins/filemanager/dfmplugin-titlebar/views/urlpushbutton.cpp

@@ -21,6 +21,7 @@
 #include <QMouseEvent>
 #include <QMenu>
 #include <QTimer>
+#include <QEventLoop>
 
 DWIDGET_USE_NAMESPACE
 using namespace dfmplugin_titlebar;
@@ -51,6 +52,10 @@ UrlPushButtonPrivate::UrlPushButtonPrivate(UrlPushButton *qq)
 
 UrlPushButtonPrivate::~UrlPushButtonPrivate()
 {
+    if (folderListWidget) {
+        folderListWidget->hide();
+        folderListWidget->deleteLater();
+    }
 }
 
 void UrlPushButtonPrivate::initConnect()
@@ -194,24 +199,40 @@ void UrlPushButtonPrivate::onSelectSubDirs()
         fmWarning("Parent is not a CrumbBar !!!");
         return;
     }
+
+    // 如果已经显示则隐藏
     if (folderListWidget && folderListWidget->isVisible()) {
         folderListWidget->hide();
         return;
     }
+
     if (crumbDatas.isEmpty())
         return;
+
+    // 保存 crumbBar 的弱引用
+    QPointer<CrumbBar> weakCrumbBar(crumbBar);
     crumbBar->setPopupVisible(true);
+
     const bool leftToRight = (q->layoutDirection() == Qt::LeftToRight);
     const int popupX = (leftToRight && !stacked) ? (q->width() - arrowWidth() - kBorderWidth) : 0;
     const QPoint popupPos = q->parentWidget()->mapToGlobal(q->geometry().bottomLeft() + QPoint(popupX, 0));
 
     if (!folderListWidget) {
         folderListWidget = new FolderListWidget(q);
         connect(folderListWidget, &FolderListWidget::urlButtonActivated, q, &UrlPushButton::urlButtonActivated);
+        connect(folderListWidget, &FolderListWidget::hidden, this, [this, weakCrumbBar]() {
+            if (weakCrumbBar) {
+                weakCrumbBar->setPopupVisible(false);
+            }
+            if (hoverFlag) {
+                hoverFlag = false;
+                q->update();
+            }
+        });
     }
-    QList<CrumbData> childDatas;
+
     if (!stacked) {
-        // 堆叠时显示堆叠目录
+        // 非堆叠时显示子目录
         requestCompleteByUrl(crumbDatas.last().url);
     } else {
         folderListWidget->setFolderList(crumbDatas, stacked);
@@ -221,12 +242,6 @@ void UrlPushButtonPrivate::onSelectSubDirs()
     QEventLoop eventLoop;
     connect(folderListWidget, &FolderListWidget::hidden, &eventLoop, &QEventLoop::quit);
     (void)eventLoop.exec(QEventLoop::DialogExec);
-
-    crumbBar->setPopupVisible(false);
-    if (hoverFlag) {
-        hoverFlag = false;
-        q->update();
-    }
 }
 
 void UrlPushButtonPrivate::onCompletionFound(const QStringList &stringList)