### 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)

if (!drag_preview || (c != drag_preview && !drag_preview->is_ancestor_of(c))) {
		return c;
	}
	return nullptr;
}
bool Viewport::_gui_drop(Control *p_at_control, Point2 p_at_pos, bool p_just_check) {
	
	CanvasItem *ci = p_at_control;
	while (ci) {
		Control *control = Object::cast_to<Control>(ci);
		if (control) {
			if (control->can_drop_data(p_at_pos, gui.drag_data)) {
				if (!p_just_check) {
					control->drop_data(p_at_pos, gui.drag_data);
				}
				return true;
			}
			if (control->data.mouse_filter == Control::MOUSE_FILTER_STOP) {
				break;
			}
		}
		p_at_pos = ci->get_transform().xform(p_at_pos);
		if (ci->is_set_as_top_level()) {
			break;
		}
		ci = ci->get_parent_item();
	}
	return false;
}
void Viewport::_gui_input_event(Ref<InputEvent> p_event) {