Exception when click-dragging through feature map

### Description

```
ERROR | 2024-01-08 19:20:32,810 | angrmanagement.data.object_container | Error raised from event of (container: The current address of the Feature Map.)4364600
Traceback (most recent call last):
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/data/object_container.py", line 32, in am_event
listener(**kwargs)
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/toolbars/feature_map_toolbar.py", line 44, in _on_feature_map_addr_selected
target_view.jump_to(addr)
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/views/disassembly_view.py", line 729, in jump_to
self._jump_to(addr, use_animation=use_animation)
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/views/disassembly_view.py", line 947, in _jump_to
self._display_function(function)
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/views/disassembly_view.py", line 924, in _display_function
self._flow_graph.function_graph = (
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qdisasm_graph.py", line 100, in function_graph
self.reload()
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qdisasm_graph.py", line 121, in reload
self._minimap.reload_target_scene()
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qminimap.py", line 192, in reload_target_scene
self._minimap_target_scene_viewer.set_scene_rect(scaled_scene_rect)
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qminimap.py", line 85, in set_scene_rect
self.update_scene_drawing()
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qminimap.py", line 106, in update_scene_drawing
self._view.set_extra_render_pass(False)
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qdisasm_graph.py", line 219, in set_extra_render_pass
b.restore_temporarily_hidden_objects()
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qblock.py", line 330, in restore_temporarily_hidden_objects
self._set_block_objects_visibility(not self._objects_are_hidden)
File "/home/matt/work/angr/angr-dev/angr-management/angrmanagement/ui/widgets/qblock.py", line 325, in _set_block_objects_visibility
obj.setVisible(visible)
RuntimeError: Internal C++ object (QBlockLabel) already deleted.
```

Breaks disasm view

### Steps to reproduce the bug

1. Run `angr-management /bin/gcc`, perform default analysis
2. When ready, click-and-drag through feature map

### Environment

_No response_

### Additional context

_No response_