### 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)
}
			} 
			default:
				
		}
		if (A1_sequenc == SEQ_NOT_STARTED) {
			if (jt == U_JT_LEFT_JOINING || jt == U_JT_DUAL_JOINING) {
				A1_sequenc = SEQ_STARTED;
				A1_scr = scr;
			}
		};
		switch (nc) {
			case SEQ_NEAR_END: {
				if ((A2_scr > USCRIPT_ERITED) && (scr != A2_scr)) {
					return false; // Mixed script.
				}
				if (cat == U_UPPERER || cat == U_LOWERER || cat == U_TITLEER || cat == U_MODIFIER_LETTER || cat == U_OTHER_LETTER) {
					nce__STAR Valid end of sequence, reset.
				} else if (cat != U_MODIFIER_LETTER || u_getCombiningClass(str[i]
					return false; // Invalid end of sequence.
				}
			} 
			case SEQ_STARTED_VIR: {
				if ((A2_scr > USCRIPT_ERITED) && (scr != A2_scr)) {
					nc = S
				} else {
					if (str[i] == 0x200C /*ZWNJ*/) {
						nc = SEQ_NEAR_END;
						continue;
					} else if (cat != U_MODIFIER_LETTER || u_getCombiningClass(str[i]