### 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)

}
		if (brk_pos == p_bbcode.length()) {
			
			if (txt.is_empty() && after_list_open_tag) {
				txt = "\n";
			}
			if (!txt.is_empty()) {
				add_text(txt);
			}
			break; 
		}
		int brk_end = p_bbcode.find("]", brk_pos + 1);
		if (brk_end == -1) {
			
			txt += p_bbcode.substr(brk_pos, p_bbcode.length() - brk_pos);
			add_text(txt);
			break;
		}
		String tag = p_bbcode.substr(brk_pos + 1, brk_end - brk_pos - 1);
		Vector<String> split_tag_block = tag.split(" ", false);
		
		String bbcode_name;
		typedef HashMap<String, String> OptionMap;
		OptionMap bbcode_options;
		if (!split_tag_block.is_empty()) {
			bbcode_name = split_tag_block[0];
			for (int i = 1; i < split_tag_block.size(); i++) {
				const String &expr = split_tag_block[i];
				int value_pos = expr.find("=");
				if (value_pos > -1) {