### 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.
return update_on_text_changed;
}
void SpinBox::set_select_all_on_focus(bool p_enabled) {
	line_edit->set_select_all_on_focus(p_enabled);
}
bool SpinBox::is_select_all_on_focus() const {
	return line_edit->is_select_all_on_focus();
}
void SpinBox::set_editable(bool p_enabled) {
	line_edit->set_editable(p_enabled);
}
bool SpinBox::is_editable() const {
	return line_edit->is_editable();
}
void SpinBox::apply() {
	_text_submitted(line_edit->get_text());
}
void SpinBox::set_custom_arrow_step(double p_custom_arrow_step) {
	custom_arrow_step = p_custom_arrow_step;
}
double SpinBox::get_custom_arrow_step() const {