### 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 (E->get()->line == p_paragraph) {
				subitem_to_remove.push_back(E);
			} else {
				break;
			}
		}
	}
	bool had_newline = false;
	
	for (int i = subitem_to_remove.size() - 1; i >= 0; i--) {
		List<Item *>::Element *subitem = subitem_to_remove[i];
		had_newline = had_newline || subitem->get()->type == ITEM_NEWLINE;
		_remove_item(subitem->get(), subitem->get()->line, p_paragraph);
	}
	if (!had_newline) {
		current_frame->lines.remove_at(p_paragraph);
	}
	if (current_frame->lines.is_empty()) {
		current_frame->lines.resize(1);
	}
	if (p_paragraph == 0 && current->subitems.size() > 0) {
		main->lines[0].from = main;
	}
	main->first_invalid_line.store(MIN(main->first_invalid_line.load(), p_paragraph));
	main->first_resized_line.store(MIN(main->first_resized_line.load(), p_paragraph));
	main->first_invalid_font_line.store(MIN(main->first_invalid_font_line.load(), p_paragraph));
	queue_redraw();
	return true;
}
void RichTextLabel::push_dropcap(const String &p_string, const Ref<Font> &p_font, int p_size, const Rect2 &p_dropcap_margins, const Color &p_color, int p_ol_size, const Color &p_ol_color) {