### 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)

pos = brk_end + 1;
			tag_stack.push_front("font_size");
		} else if (tag.begins_with("opentype_features=") || tag.begins_with("otf=")) {
			int value_pos = tag.find("=");
			String fnt_ftr = tag.substr(value_pos + 1);
			Vector<String> subtag = fnt_ftr.split(",");
			_normalize_subtags(subtag);
			if (subtag.size() > 0) {
				Ref<Font> font = theme_cache.normal_font;
				DefaultFont def_font = NORMAL_FONT;
				ItemFont *font_it = _find_font(current);
				if (font_it) {
					if (font_it->font.is_valid()) {
						font = font_it->font;
						def_font = font_it->def_font;
					}
				}
				Dictionary features;
				for (int i = 0; i < subtag.size(); i++) {
					Vector<String> subtag_a = subtag[i].split("=");
					_normalize_subtags(subtag_a);
					if (subtag_a.size() == 2) {
						features[TS->name_to_tag(subtag_a[0])] = subtag_a[1].to_int();
					} else if (subtag_a.size() == 1) {
						features[TS->name_to_tag(subtag_a[0])] = 1;
					}
				}
				Ref<FontVariation> fc;
				fc.instantiate();
				fc->set_base_font(font);