### 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)
}
				if ((os2->ulUnicodeRange1 & 1L << 28) || (os2->ulUnicodeRange2 & 1L << 20) || (os2->ulUnicodeRange2 & 1L << 24)) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_HANGUL);
				}
				if ((os2->ulUnicodeRange2 & 1L << 21) || (os2->ulUnicodeRange2 & 1L << 22) || (os2->ulUnicodeRange2 & 1L << 23) || (os2->ulUnicodeRange2 & 1L << 26) || (os2->ulUnicodeRange2 & 1L << 27) || (os2->ulUnicodeRange2 & 1L << 29)) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_HAN);
				}
				if (os2->ulUnicodeRange2 & 1L << 17) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_HIRAGANA);
				}
				if (os2->ulUnicodeRange2 & 1L << 18) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_KATAKANA);
				}
				if (os2->ulUnicodeRange2 & 1L << 19) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_BOPOMOFO);
				}
				if (os2->ulUnicodeRange3 & 1L << 6) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_TIBETAN);
				}
				if (os2->ulUnicodeRange3 & 1L << 7) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_SYRIAC);
				}
				if (os2->ulUnicodeRange3 & 1L << 8) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_THAANA);
				}
				if (os2->ulUnicodeRange3 & 1L << 9) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_SINHALA);
				}
				if (os2->ulUnicodeRange3 & 1L << 10) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_MYANMAR);