### 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)

_stop_thread();
	MutexLock data_lock(data_mutex);
	ERR_FAIL_COND(current->type != ITEM_TABLE);
	ItemTable *table = static_cast<ItemTable *>(current);
	ERR_FAIL_INDEX(p_column, (int)table->columns.size());
	table->columns[p_column].expand = p_expand;
	table->columns[p_column].expand_ratio = p_ratio;
}
void RichTextLabel::set_cell_row_background_color(const Color &p_odd_row_bg, const Color &p_even_row_bg) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ERR_FAIL_COND(current->type != ITEM_FRAME);
	ItemFrame *cell = static_cast<ItemFrame *>(current);
	ERR_FAIL_COND(!cell->cell);
	cell->odd_row_bg = p_odd_row_bg;
	cell->even_row_bg = p_even_row_bg;
}
void RichTextLabel::set_cell_border_color(const Color &p_color) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ERR_FAIL_COND(current->type != ITEM_FRAME);
	ItemFrame *cell = static_cast<ItemFrame *>(current);
	ERR_FAIL_COND(!cell->cell);
	cell->border = p_color;
}
void RichTextLabel::set_cell_size_override(const Size2 &p_min_size, const Size2 &p_max_size) {