### 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 suffix;
}
void SpinBox::set_prefix(const String &p_prefix) {
	if (prefix == p_prefix) {
		return;
	}
	prefix = p_prefix;
	_update_text();
}
String SpinBox::get_prefix() const {
	return prefix;
}
void SpinBox::set_update_on_text_changed(bool p_enabled) {
	if (update_on_text_changed == p_enabled) {
		return;
	}
	update_on_text_changed = p_enabled;
	if (p_enabled) {
		line_edit->connect("text_changed", callable_mp(this, &SpinBox::_text_changed), CONNECT_DEFERRED);
	} else {
		line_edit->disconnect("text_changed", callable_mp(this, &SpinBox::_text_changed));
	}
}
bool SpinBox::get_update_on_text_changed() const {