### Godot version

v4.2.dev4.official [549fcce5f]

### System information

Ubuntu 20.04 LTS

### Issue description

See title.

### Steps to reproduce

1. Create a new project
2. Create a csv file that includes the following
```
key,ar
key,placeholder
```
3. Add the generated `.translation` file to Project -> Project Settings... -> Localization
4. In Project -> Project Settings... -> Internationalization -> Locale, set `Test` to `ar`
5. Add a `LineEdit` node and type `-=[]{}`
6. Run the project, and notice that the text is on the right side, but the symbols are incorrectly in LTR (`-=[]{}`).  Correct output is `{}[]=-`
7. Back in the editor, add a single Arabic letter (any will do), and notice that `LineEdit` immediately (and correctly) flips the symbols, and the newly-added Arabic letter, to RTL.

**Notes**
- Identical behavior is seen with `TextEdit`.
- The purpose of steps 2-4 are to simulate an Arabic environment when the project is run, despite `OS.get_locale() == "en"` (or your system's current language).

### Minimal reproduction project

[rtlsymbols.zip](https://github.com/godotengine/godot/files/12525509/rtlsymbols.zip)
}
	for (short i = 0; i < fd->cache[size]->face->glyph->outline.n_points; i++) {
		points.push_back(Vector3(fd->cache[size]->face->glyph->outline.points[i].x * scale, -fd->cache[size]->face->glyph->outline.points[i].y * scale, FT_CURVE_TAG(fd->cache[size]->face->glyph->outline.tags[i])));
	}
	for (short i = 0; i < fd->cache[size]->face->glyph->outline.n_contours; i++) {
		contours.push_back(fd->cache[size]->face->glyph->outline.contours[i]);
	}
	bool orientation = (FT_Outline_Get_Orientation(&fd->cache[size]->face->glyph->outline) == FT_ORIENTATION_FILL_RIGHT);
	Dictionary out;
	out["points"] = points;
	out["contours"] = contours;
	out["orientation"] = orientation;
	return out;
#else
	return Dictionary();
#endif
}
TypedArray<Vector2i> TextServerAdvanced::_font_get_kerning_list(const RID &p_font_rid, int64_t p_size) const {
	FontAdvanced *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, TypedArray<Vector2i>());
	MutexLock lock(fd->mutex);
	Vector2i size = _get_size(fd, p_size);
	ERR_FAIL_COND_V(!_ensure_cache_for_size(fd, size), TypedArray<Vector2i>());
	TypedArray<Vector2i> ret;
	for (const KeyValue<Vector2i, FontForSizeAdvanced *> &E : fd->cache) {
		ret.push_back(E.key);
	}
	return ret;
}
void TextServerAdvanced::_font_clear_kerning_map(const RID &p_font_rid, int64_t p_size) {