### Godot version

v4.1.beta.custom_build [d3651ea45]

### System information

Windows 11

### Issue description

![1](https://github.com/godotengine/godot/assets/28705694/15c14c93-7ad7-425a-8fb0-bef841b75527)

It's not possible to start text selection on a SpinBox when it's unfocused.

Note: After a bit of digging in the code, I found that clicking on a SpintBox doesn't trigger `SpinBox::gui_input` no matter if it's focused or not. However, releasing mouse left button does trigger the function.

### Steps to reproduce

See the gif.

### Minimal reproduction project

It's simple to reproduce.
} break;
		case NOTIFICATION_EXIT_TREE: {
			_release_mouse();
		} break;
		case NOTIFICATION_TRANSLATION_CHANGED: {
			queue_redraw();
		} break;
		case NOTIFICATION_THEME_CHANGED: {
			call_deferred(SNAME("update_minimum_size"));
			get_line_edit()->call_deferred(SNAME("update_minimum_size"));
		} break;
		case NOTIFICATION_LAYOUT_DIRECTION_CHANGED: {
			queue_redraw();
		} break;
	}
}
void SpinBox::set_horizontal_alignment(HorizontalAlignment p_alignment) {
	line_edit->set_horizontal_alignment(p_alignment);
}
HorizontalAlignment SpinBox::get_horizontal_alignment() const {
	return line_edit->get_horizontal_alignment();
}
void SpinBox::set_suffix(const String &p_suffix) {
	if (suffix == p_suffix) {
		return;
	}
	suffix = p_suffix;
	_update_text();
}
String SpinBox::get_suffix() const {