### 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)

_normalize_subtags(subtag);
				if (subtag.size() > 1) {
					if (subtag[0] == "top" || subtag[0] == "t") {
						alignment = INLINE_ALIGNMENT_TOP_TO;
					} else if (subtag[0] == "center" || subtag[0] == "c") {
						alignment = INLINE_ALIGNMENT_CENTER_TO;
					} else if (subtag[0] == "bottom" || subtag[0] == "b") {
						alignment = INLINE_ALIGNMENT_BOTTOM_TO;
					}
					if (subtag[1] == "top" || subtag[1] == "t") {
						alignment |= INLINE_ALIGNMENT_TO_TOP;
					} else if (subtag[1] == "center" || subtag[1] == "c") {
						alignment |= INLINE_ALIGNMENT_TO_CENTER;
					} else if (subtag[1] == "baseline" || subtag[1] == "l") {
						alignment |= INLINE_ALIGNMENT_TO_BASELINE;
					} else if (subtag[1] == "bottom" || subtag[1] == "b") {
						alignment |= INLINE_ALIGNMENT_TO_BOTTOM;
					}
				} else if (subtag.size() > 0) {
					if (subtag[0] == "top" || subtag[0] == "t") {
						alignment = INLINE_ALIGNMENT_TOP;
					} else if (subtag[0] == "center" || subtag[0] == "c") {
						alignment = INLINE_ALIGNMENT_CENTER;
					} else if (subtag[0] == "bottom" || subtag[0] == "b") {
						alignment = INLINE_ALIGNMENT_BOTTOM;
					}
				}
			}
			int end = p_bbcode.find("[", brk_end);
			if (end == -1) {