### 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)

if (!is_visible()) {
		return 0;
	}
	const_cast<RichTextLabel *>(this)->_validate_line_caches();
	return visible_line_count;
}
void RichTextLabel::set_selection_enabled(bool p_enabled) {
	if (selection.enabled == p_enabled) {
		return;
	}
	selection.enabled = p_enabled;
	if (!p_enabled) {
		if (selection.active) {
			deselect();
		}
		set_focus_mode(FOCUS_NONE);
	} else {
		set_focus_mode(FOCUS_ALL);
	}
}
void RichTextLabel::set_deselect_on_focus_loss_enabled(const bool p_enabled) {
	if (deselect_on_focus_loss_enabled == p_enabled) {
		return;
	}
	deselect_on_focus_loss_enabled = p_enabled;
	if (p_enabled && selection.active && !has_focus()) {
		deselect();
	}
}
Variant RichTextLabel::get_drag_data(const Point2 &p_point) {