### 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.from_item = nullptr;
								selection.from_char = 0;
								selection.to_frame = nullptr;
								selection.to_line = 0;
								selection.to_item = nullptr;
								selection.to_char = 0;
								deselect();
							}
						}
					}
				}
			} else if (b->is_pressed() && b->is_double_click() && selection.enabled) {
				
				ItemFrame *c_frame = nullptr;
				int c_line = 0;
				Item *c_item = nullptr;
				int c_index = 0;
				bool outside;
				selection.drag_attempt = false;
				_find_click(main, b->get_position(), &c_frame, &c_line, &c_item, &c_index, &outside, false);
				if (c_frame) {
					const Line &l = c_frame->lines[c_line];
					MutexLock lock(l.text_buf->get_mutex());
					PackedInt32Array words = TS->shaped_text_get_word_breaks(l.text_buf->get_rid());
					for (int i = 0; i < words.size(); i = i + 2) {
						if (c_index >= words[i] && c_index < words[i + 1]) {
							selection.from_frame = c_frame;
							selection.from_line = c_line;
							selection.from_item = c_item;
							selection.from_char = words[i];