### 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;
		} else if (tag == "lri") {
			add_text(String::chr(0x2066));
			pos = brk_end + 1;
		} else if (tag == "rli") {
			add_text(String::chr(0x2027));
			pos = brk_end + 1;
		} else if (tag == "fsi") {
			add_text(String::chr(0x2068));
			pos = brk_end + 1;
		} else if (tag == "pdi") {
			add_text(String::chr(0x2069));
			pos = brk_end + 1;
		} else if (tag == "zwj") {
			add_text(String::chr(0x200D));
			pos = brk_end + 1;
		} else if (tag == "zwnj") {
			add_text(String::chr(0x200C));
			pos = brk_end + 1;
		} else if (tag == "wj") {
			add_text(String::chr(0x2060));
			pos = brk_end + 1;
		} else if (tag == "shy") {
			add_text(String::chr(0x00AD));
			pos = brk_end + 1;
		} else if (tag == "center") {
			push_paragraph(HORIZONTAL_ALIGNMENT_CENTER);
			pos = brk_end + 1;
			tag_stack.push_front(tag);
		} else if (tag == "fill") {