### 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.
int w = icon->get_width();
	if ((w != last_w)) {
		line_edit->set_offset(SIDE_LEFT, 0);
		line_edit->set_offset(SIDE_RIGHT, -w);
		last_w = w;
	}
}
void SpinBox::_update_theme_item_cache() {
	Range::_update_theme_item_cache();
	theme_cache.updown_icon = get_theme_icon(SNAME("updown"));
}
void SpinBox::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_DRAW: {
			_update_text();
			_adjust_width_for_icon(theme_cache.updown_icon);
			RID ci = get_canvas_item();
			Size2i size = get_size();
			if (is_layout_rtl()) {
				theme_cache.updown_icon->draw(ci, Point2i(0, (size.height - theme_cache.updown_icon->get_height()) / 2));
			} else {
				theme_cache.updown_icon->draw(ci, Point2i(size.width - theme_cache.updown_icon->get_width(), (size.height - theme_cache.updown_icon->get_height()) / 2));
			}
		} break;
		case NOTIFICATION_ENTER_TREE: {
			_adjust_width_for_icon(theme_cache.updown_icon);
			_update_text();