### 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)

set_text(text);
			}
			main->first_invalid_line.store(0); 
			queue_redraw();
		} break;
		case NOTIFICATION_PREDELETE:
		case NOTIFICATION_EXIT_TREE: {
			_stop_thread();
		} break;
		case NOTIFICATION_LAYOUT_DIRECTION_CHANGED:
		case NOTIFICATION_TRANSLATION_CHANGED: {
			_apply_translation();
			queue_redraw();
		} break;
		case NOTIFICATION_INTERNAL_PHYSICS_PROCESS: {
			if (is_visible_in_tree()) {
				queue_redraw();
			}
		} break;
		case NOTIFICATION_DRAW: {
			RID ci = get_canvas_item();
			Size2 size = get_size();
			draw_style_box(theme_cache.normal_style, Rect2(Point2(), size));
			if (has_focus()) {
				RenderingServer::get_singleton()->canvas_item_add_clip_ignore(ci, true);
				draw_style_box(theme_cache.focus_style, Rect2(Point2(), size));
				RenderingServer::get_singleton()->canvas_item_add_clip_ignore(ci, false);
			}
			
			if (_validate_line_caches()) {