app: fix overlaid FileWidgets in conversation view

securedrop_client/gui/widgets.py

@@ -2196,6 +2196,7 @@ def eventFilter(self, obj, event):
 
     def _set_file_state(self):
         if self.file.is_decrypted:
+            logger.debug('Changing file {} state to decrypted/downloaded'.format(self.uuid))
             self._set_file_name()
             self.download_button.hide()
             self.no_file_name.hide()
@@ -2204,6 +2205,7 @@ def _set_file_state(self):
             self.print_button.show()
             self.file_name.show()
         else:
+            logger.debug('Changing file {} state to not downloaded'.format(self.uuid))
             self.download_button.setText(_('DOWNLOAD'))
             # Ensure correct icon depending on mouse hover state.
             if self.download_button.underMouse():
@@ -3005,6 +3007,7 @@ def update_conversation(self, collection: list) -> None:
         for item_widget in current_conversation.values():
             logger.debug('Deleting item: {}'.format(item_widget.uuid))
             self.current_messages.pop(item_widget.uuid)
+            item_widget.deleteLater()
             self.conversation_layout.removeWidget(item_widget)
 
     def add_file(self, file: File, index):