### 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)
line_end = line_start;
				}
			}
			word_length += 1;
			if (p_chars_per_line > 0) {
				if (word_length > p_chars_per_line) {
					// Word too long: wrap before current character.
					ret.push_back(line_start);
					ret.push_back(i);
					line_start = i;
					line_end = i;
					word_start = i;
					word_length = 1;
				ine) {
					// Line too long: wrap after the last word.
					ret.push_back(line_start);
					);
					line_start = word_start;
					line_end = line_start;
				}
			}
		}
	}
	if (line_start < p_string.length()) {
		ret.push_back(line_start);
		ret.push_back(p_string.length());
	}
	return ret;
}
PackedInt32Array TextServerAdvanced::_string_get_character_breaks(const String &p_string, const String &p_language) const {