### 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)
return msdfgen::Point2(vector.x / 60.0f, vector.y / 60.0f);
}
static int ft_move_to(const FT_Vector *to, void *user) {
	MSContext *context = static_cast<MSContext *>(user);
	if (!(context->contour && context->contour->edges.empty())) {
		context->contour = &context->shape->addContour();
	}
	context->position = ft_point2(*to);
	return 0;
}
static int ft_line_to(const FT_Vector *to, void *user) {
	MSContext *context = static_cast<MSContext *>(user);
	msdfgen::Point2 endpoint = ft_point2(*to);
	if (endpoint != context->position) {
		context->contour->addEdge(new msdfgen::LinearSegment(context->position, endpoint));
		context->position = endpoint;
	}
	return 0;
}
static int ft_conic_to(const FT_Vector *control, const FT_Vector *to, void *user) {