### 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)

selection.to_frame = c_frame;
							selection.to_line = c_line;
							selection.to_item = c_item;
							selection.to_char = words[i + 1];
							selection.active = true;
							if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
								DisplayServer::get_singleton()->clipboard_set_primary(get_selected_text());
							}
							queue_redraw();
							break;
						}
					}
				}
			} else if (!b->is_pressed()) {
				if (selection.enabled && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
					DisplayServer::get_singleton()->clipboard_set_primary(get_selected_text());
				}
				selection.click_item = nullptr;
				if (selection.drag_attempt) {
					selection.drag_attempt = false;
					if (_is_click_inside_selection()) {
						selection.from_frame = nullptr;
						selection.from_line = 0;
						selection.from_item = nullptr;
						selection.from_char = 0;
						selection.to_frame = nullptr;
						selection.to_line = 0;
						selection.to_item = nullptr;
						selection.to_char = 0;
						deselect();