### 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)

push_paragraph(HORIZONTAL_ALIGNMENT_FILL);
			pos = brk_end + 1;
			tag_stack.push_front(tag);
		} else if (tag == "left") {
			push_paragraph(HORIZONTAL_ALIGNMENT_LEFT);
			pos = brk_end + 1;
			tag_stack.push_front(tag);
		} else if (tag == "right") {
			push_paragraph(HORIZONTAL_ALIGNMENT_RIGHT);
			pos = brk_end + 1;
			tag_stack.push_front(tag);
		} else if (tag == "ul") {
			indent_level++;
			push_list(indent_level, LIST_DOTS, false);
			pos = brk_end + 1;
			tag_stack.push_front(tag);
		} else if (tag.begins_with("ul bullet=")) {
			String bullet = tag.substr(10, 1);
			indent_level++;
			push_list(indent_level, LIST_DOTS, false, bullet);
			pos = brk_end + 1;
			tag_stack.push_front("ul");
		} else if ((tag == "ol") || (tag == "ol type=1")) {
			indent_level++;
			push_list(indent_level, LIST_NUMBERS, false);
			pos = brk_end + 1;
			tag_stack.push_front("ol");
		} else if (tag == "ol type=a") {
			indent_level++;
			push_list(indent_level, LIST_LETTERS, false);