### 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)

color = Color::from_string(color_option->value, color);
			}
			float frequency = 1.0;
			OptionMap::Iterator freq_option = bbcode_options.find("freq");
			if (freq_option) {
				frequency = freq_option->value.to_float();
			}
			float ease = -2.0;
			OptionMap::Iterator ease_option = bbcode_options.find("ease");
			if (ease_option) {
				ease = ease_option->value.to_float();
			}
			push_pulse(color, frequency, ease);
			pos = brk_end + 1;
			tag_stack.push_front("pulse");
			set_process_internal(true);
		} else if (tag.begins_with("bgcolor=")) {
			String color_str = tag.substr(8, tag.length()).unquote();
			Color color = Color::from_string(color_str, theme_cache.default_color);
			push_bgcolor(color);
			pos = brk_end + 1;
			tag_stack.push_front("bgcolor");
		} else if (tag.begins_with("fgcolor=")) {
			String color_str = tag.substr(8, tag.length()).unquote();
			Color color = Color::from_string(color_str, theme_cache.default_color);
			push_fgcolor(color);
			pos = brk_end + 1;
			tag_stack.push_front("fgcolor");
		} else {
			Vector<String> &expr = split_tag_block;