### 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)

diff.x = MIN(diff.x, limit.x);
						diff.y = 0;
						r.position += diff;
						r.size -= diff;
					} break;
					case SUB_WINDOW_RESIZE_RIGHT: {
						diff.x = MAX(diff.x, -limit.x);
						r.size.x += diff.x;
					} break;
					case SUB_WINDOW_RESIZE_BOTTOM_LEFT: {
						diff.x = MIN(diff.x, limit.x);
						diff.y = MAX(diff.y, -limit.y);
						r.position.x += diff.x;
						r.size.x -= diff.x;
						r.size.y += diff.y;
					} break;
					case SUB_WINDOW_RESIZE_BOTTOM: {
						diff.y = MAX(diff.y, -limit.y);
						r.size.y += diff.y;
					} break;
					case SUB_WINDOW_RESIZE_BOTTOM_RIGHT: {
						diff.x = MAX(diff.x, -limit.x);
						diff.y = MAX(diff.y, -limit.y);
						r.size += diff;
					} break;
					default: {
					}
				}
				Size2i max_size = gui.subwindow_focused->get_max_size();
				if ((max_size.x > 0 || max_size.y > 0) && (max_size.x >= min_size.x && max_size.y >= min_size.y)) {