Fixed core dumped on close

bagheeraview.py

@@ -34,7 +34,7 @@ from itertools import groupby
 from PySide6.QtWidgets import (
     QApplication, QMainWindow, QWidget, QLabel, QVBoxLayout, QHBoxLayout, QLineEdit,
     QTextEdit, QPushButton, QFileDialog, QComboBox, QSlider, QMessageBox, QSizePolicy,
-    QMenu, QInputDialog, QTableWidget, QTableWidgetItem, QHeaderView, QTabWidget,
+    QMenu, QInputDialog, QTableWidget, QTableWidgetItem, QHeaderView, QTabWidget, QProgressDialog,
     QDockWidget, QAbstractItemView, QRadioButton, QButtonGroup, QListView,
     QStyledItemDelegate, QStyle, QDialog, QKeySequenceEdit, QDialogButtonBox
 )
@@ -2010,6 +2010,9 @@ class MainWindow(QMainWindow):
 
     def perform_shutdown(self):
         """Performs cleanup operations before the application closes."""
+        if getattr(self, '_is_shutting_down', False):
+            return
+        self._is_shutting_down = True
         self.is_cleaning = True
 
         # Save configuration early if visible, as per user request.
@@ -2017,6 +2020,24 @@ class MainWindow(QMainWindow):
         if self.isVisible():
             self.save_config()
 
+        # Stop all pending UI timers to prevent background tasks from triggering
+        self.hide_progress_timer.stop()
+        self.filter_input_timer.stop()
+        self.filter_refresh_timer.stop()
+        self.thumbnails_refresh_timer.stop()
+        self.rebuild_timer.stop()
+        self._model_update_timer.stop()
+        self.resume_scan_timer.stop()
+
+        # Close all viewers first to stop their preloader threads
+        self.close_all_viewers()
+
+        # Close duplicate manager if open to stop its preloader threads
+        if HAVE_IMAGEHASH:
+            for widget in QApplication.topLevelWidgets():
+                if isinstance(widget, DuplicateManagerDialog):
+                    widget.close()
+
         self.fs_watcher.stop()
         # 1. Stop all worker threads interacting with the cache
 
@@ -2053,7 +2074,19 @@ class MainWindow(QMainWindow):
 
         # Ensure all QRunnables in the shared thread pool are finished
         if self.thread_pool_manager:
-            self.thread_pool_manager.get_pool().waitForDone()
+            pool = self.thread_pool_manager.get_pool()
+            if pool.activeThreadCount() > 0:
+                progress = QProgressDialog(UITexts.SHUTTING_DOWN, None, 0, 0, self)
+                progress.setWindowTitle(PROG_NAME)
+                progress.setWindowModality(Qt.ApplicationModal)
+                progress.setMinimumDuration(0)
+                progress.show()
+
+                # Wait in small increments to keep the UI responsive
+                while not pool.waitForDone(100):
+                    if QApplication.instance():
+                        QApplication.processEvents()
+                progress.close()
 
         if self.duplicate_cache:
             self.duplicate_cache.lmdb_close()