### 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)

charfx->outline = false;
						charfx->font = frid;
						charfx->glyph_index = gl;
						charfx->glyph_flags = gl_fl;
						charfx->glyph_count = gl_cn;
						charfx->offset = fx_offset;
						charfx->color = font_color;
						bool effect_status = custom_effect->_process_effect_impl(charfx);
						custom_fx_ok = effect_status;
						fx_offset += charfx->offset;
						font_color = charfx->color;
						frid = charfx->font;
						gl = charfx->glyph_index;
						txt_visible &= charfx->visibility;
					}
				} else if (item_fx->type == ITEM_SHAKE) {
					ItemShake *item_shake = static_cast<ItemShake *>(item_fx);
					if (!cn) {
						uint64_t char_current_rand = item_shake->offset_random(glyphs[i].start);
						uint64_t char_previous_rand = item_shake->offset_previous_random(glyphs[i].start);
						uint64_t max_rand = 2147483647;
						double current_offset = Math::remap(char_current_rand % max_rand, 0, max_rand, 0.0f, 2.f * (float)Math_PI);
						double previous_offset = Math::remap(char_previous_rand % max_rand, 0, max_rand, 0.0f, 2.f * (float)Math_PI);
						double n_time = (double)(item_shake->elapsed_time / (0.5f / item_shake->rate));
						n_time = (n_time > 1.0) ? 1.0 : n_time;
						item_shake->prev_off = Point2(Math::lerp(Math::sin(previous_offset), Math::sin(current_offset), n_time), Math::lerp(Math::cos(previous_offset), Math::cos(current_offset), n_time)) * (float)item_shake->strength / 10.0f;
					}
					fx_offset += item_shake->prev_off;
				} else if (item_fx->type == ITEM_WAVE) {
					ItemWave *item_wave = static_cast<ItemWave *>(item_fx);