### 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)
switch (p_feature) {
		case FEATURE_SIMPLE_LAYOUT:
		case FEATURE_BIDI_LAYOUT:
		case FEATURE_VERTICAL_LAYOUT:
		case FEATURE_SHAPING:
		case FEATURE_KASHIDA_JUSTIFICATION:
		case FEATURE_BREAK_ITERATORS:
		case FEATURE_FONT_BITMAP:
#ifdef MODULE_FREETYPE_ENABLED
		case FEATURE_FONT_DYNAMIC:
#endif
#ifdef MODULE_MSDFGEN_ENABLED
		case FEATURE_FONT_MSDF:
#endif
		case FEATURE_FONT_VARIABLE:
		case FEATURE_CONTEXT_SENSITIVE_CASE_CONVERSION:
		case FEATURE_USE_SUPPORT_DATA:
		case FEATURE_UNICODE_IDENTIFIERS:
		case FEATURE_UNICODE_SECURITY:
			return true;
		default: {
		}
	}
	return false;
}
String TextServerAdvanced::_get_name() const {