### 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)

Transform2D get_screen_transform() const;
	virtual Transform2D get_screen_transform_internal(bool p_absolute_position = false) const;
	virtual Transform2D get_popup_base_transform() const { return Transform2D(); }
#ifndef _3D_DISABLED
	bool use_xr = false;
	friend class AudioListener3D;
	AudioListener3D *audio_listener_3d = nullptr;
	HashSet<AudioListener3D *> audio_listener_3d_set;
	bool is_audio_listener_3d_enabled = false;
	RID internal_audio_listener_3d;
	AudioListener3D *get_audio_listener_3d() const;
	void set_as_audio_listener_3d(bool p_enable);
	bool is_audio_listener_3d() const;
	void _update_audio_listener_3d();
	void _listener_transform_3d_changed_notify();
	void _audio_listener_3d_set(AudioListener3D *p_listener);
	bool _audio_listener_3d_add(AudioListener3D *p_listener); 
	void _audio_listener_3d_remove(AudioListener3D *p_listener);
	void _audio_listener_3d_make_next_current(AudioListener3D *p_exclude);
	void _collision_object_3d_input_event(CollisionObject3D *p_object, Camera3D *p_camera, const Ref<InputEvent> &p_input_event, const Vector3 &p_pos, const Vector3 &p_normal, int p_shape);
	struct Camera3DOverrideData {
		Transform3D transform;
		enum Projection {