Cleanup mypy lint

main.py

@@ -19,9 +19,9 @@ from PyQt6.QtCore import (
     pyqtSignal,
     pyqtSlot,
 )
+from PyQt6.QtGui import QContextMenuEvent
 from PyQt6.QtSql import QSqlDatabase, QSqlQuery, QSqlQueryModel
 from PyQt6.QtWidgets import QApplication, QFileDialog, QMainWindow, QMenu
-from PyQt6.QtGui import QContextMenuEvent
 
 from lib import Book, PersonDialog, ReadDialog, SessionDialog, query_error
 from lib.preferences import Preferences
@@ -60,7 +60,8 @@ class MainWindow(QMainWindow, Ui_MainWindow):
         self.show()
         return
 
-    def contextMenuEvent(self, event: QContextMenuEvent) -> None:
+    def contextMenuEvent(self, event: Optional[QContextMenuEvent]) -> None:
+        assert event is not None
         localPos = self.peopleView.mapFromGlobal(event.globalPos())
         if not self.peopleView.rect().contains(localPos):
             return