### Godot version

v4.1.stable.official [970459615]

### System information

Godot v4.1.stable - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce MX330 (NVIDIA; 30.0.15.1169) - 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz (8 Threads)

### Issue description

Calling `RichTextLabel`'s `select_all` method has no visual indicator, but it must have one. 

### Steps to reproduce

- Add `RichTextLabel` node
- Set `selection_enabled` value to be `true`
- Call `$RichTextLabel.select_all() `method in `_ready`

### Minimal reproduction project

[RichTextLabel_bug.zip](https://github.com/godotengine/godot/files/12098913/RichTextLabel_bug.zip)

for (int i = 0; i < custom_effects.size(); i++) {
		Ref<RichTextEffect> effect = custom_effects[i];
		if (!effect.is_valid()) {
			continue;
		}
		if (effect->get_bbcode() == p_bbcode_identifier) {
			return effect;
		}
	}
	return Ref<RichTextEffect>();
}
Dictionary RichTextLabel::parse_expressions_for_values(Vector<String> p_expressions) {