### Godot version

4.1.dev 2e273f0e35800f2bcc7c05db54100caa97928f69

### System information

macOS 13.4

### Issue description

Removing a SpinBox from the node tree using `remove_child` during the line edit text submit signal will crash the engine.

```
handle_crash: Program crashed with signal 11
Engine version: Godot Engine v4.1.dev.custom_build (2e273f0e35800f2bcc7c05db54100caa97928f69)
Dumping the backtrace. Please include this when reporting the bug to the project developer.
[1] 1   libsystem_platform.dylib            0x0000000183b5aa24 _sigtramp + 56
[2] Viewport::gui_get_focus_owner() (in godot.macos.editor.arm64) + 32
[3] SpinBox::_line_edit_focus_exit() (in godot.macos.editor.arm64) + 28
[4] CallQueue::_call_function(Callable const&, Variant const*, int, bool) (in godot.macos.editor.arm64) + 336
[5] CallQueue::flush() (in godot.macos.editor.arm64) + 908
[6] SceneTree::physics_process(double) (in godot.macos.editor.arm64) + 244
[7] Main::iteration() (in godot.macos.editor.arm64) + 528
```

### Steps to reproduce

Open the minimal reproduction project, click on the SpinBox, press enter, and the engine crashes.

### Minimal reproduction project

[SpinBoxTextSubmitCrash.zip](https://github.com/godotengine/godot/files/11631081/SpinBoxTextSubmitCrash.zip)

co->_mouse_enter();
								} else {
									F->value = frame;
									
									if (mm.is_valid() && mm->get_device() == InputEvent::DEVICE_ID_INTERNAL) {
										send_event = false;
									}
								}
								HashMap<Pair<ObjectID, int>, uint64_t, PairHash<ObjectID, int>>::Iterator SF = physics_2d_shape_mouseover.find(Pair(res[i].collider_id, res[i].shape));
								if (!SF) {
									physics_2d_shape_mouseover.insert(Pair(res[i].collider_id, res[i].shape), frame);
									co->_mouse_shape_enter(res[i].shape);
								} else {
									SF->value = frame;
								}
							}
							if (send_event) {
								co->_input_event_call(this, ev, res[i].shape);
							}
						}
					}
				}
			}
			if (is_mouse) {
				_cleanup_mouseover_colliders(false, false, frame);
			}
		}
#ifndef _3D_DISABLED
		CollisionObject3D *capture_object = nullptr;
		if (physics_object_capture.is_valid()) {