### 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)

List<Item *>::Element *E = p_reverse_search ? table->subitems.back() : table->subitems.front();
				if (_search_table(table, E, p_string, p_reverse_search)) {
					return true;
				}
			} break;
			default:
				break;
		}
	}
	int sp = -1;
	if (p_reverse_search) {
		sp = txt.rfindn(p_string, p_char_idx);
	} else {
		sp = txt.findn(p_string, p_char_idx);
	}
	if (sp != -1) {
		selection.from_frame = p_frame;
		selection.from_line = p_line;
		selection.from_item = _get_item_at_pos(l.from, it_to, sp);
		selection.from_char = sp;
		selection.to_frame = p_frame;
		selection.to_line = p_line;
		selection.to_item = _get_item_at_pos(l.from, it_to, sp + p_string.length());
		selection.to_char = sp + p_string.length();
		selection.active = true;
		return true;
	}
	return false;
}
bool RichTextLabel::search(const String &p_string, bool p_from_selection, bool p_search_previous) {