### 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)

font_size = font_size_it->font_size;
					}
					if (rtl) {
						stop += tab_size * font->get_char_size(' ', font_size).width;
						if (stop > p_click.x) {
							break;
						}
					} else {
						stop -= tab_size * font->get_char_size(' ', font_size).width;
						if (stop < p_click.x) {
							break;
						}
					}
					*r_click_item = _find_indentable((*r_click_item)->parent);
				}
			}
		}
		if (r_click_frame != nullptr) {
			*r_click_frame = p_frame;
		}
		if (r_click_line != nullptr) {
			*r_click_line = p_line;
		}
		if (r_click_char != nullptr) {
			*r_click_char = char_pos;
		}
	}
	return off.y;
}
void RichTextLabel::_scroll_changed(double) {