### 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)

connected = connected_option->value.to_int();
			}
			push_tornado(frequency, radius, connected);
			pos = brk_end + 1;
			tag_stack.push_front("tornado");
			set_process_internal(true);
		} else if (bbcode_name == "rainbow") {
			float saturation = 0.8f;
			OptionMap::Iterator saturation_option = bbcode_options.find("sat");
			if (saturation_option) {
				saturation = saturation_option->value.to_float();
			}
			float value = 0.8f;
			OptionMap::Iterator value_option = bbcode_options.find("val");
			if (value_option) {
				value = value_option->value.to_float();
			}
			float frequency = 1.0f;
			OptionMap::Iterator frequency_option = bbcode_options.find("freq");
			if (frequency_option) {
				frequency = frequency_option->value.to_float();
			}
			push_rainbow(saturation, value, frequency);
			pos = brk_end + 1;
			tag_stack.push_front("rainbow");
			set_process_internal(true);
		} else if (bbcode_name == "pulse") {
			Color color = Color(1, 1, 1, 0.25);
			OptionMap::Iterator color_option = bbcode_options.find("color");
			if (color_option) {