### 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)
start_pos += sd->glyphs[start_pos].count;
		}
		while ((start_pos < end_pos) && ((sd->glyphs[end_pos].flags & GRAPHEME_IS_SPACE) == GRAPHEME_IS_SPACE || (sd->glyphs[end_pos].flags & GRAPHEME_IS_BREAK_HARD) == GRAPHEME_IS_BREAK_HARD || (sd->glyphs[end_pos].flags & GRAPHEME_IS_BREAK_SOFT) == GRAPHEME_IS_BREAK_SOFT)) {
			justification_width -= sd->glyphs[end_pos].advance * sd->glyphs[end_pos].repeat;
			sd->glyphs.write[end_pos].advance = 0;
			end_pos -= sd->glyphs[end_pos].count;
		}
	} else {
		
		while ((start_pos < end_pos) && ((sd->glyphs[start_pos].flags & GRAPHEME_IS_BREAK_HARD) == GRAPHEME_IS_BREAK_HARD || (sd->glyphs[start_pos].flags & GRAPHEME_IS_BREAK_SOFT) == GRAPHEME_IS_BREAK_SOFT)) {
			start_pos += sd->glyphs[start_pos].count;
		}
		while ((start_pos < end_pos) && ((sd->glyphs[end_pos].flags & GRAPHEME_IS_BREAK_HARD) == GRAPHEME_IS_BREAK_HARD || (sd->glyphs[end_pos].flags & GRAPHEME_IS_BREAK_SOFT) == GRAPHEME_IS_BREAK_SOFT)) {
			end_pos -= sd->glyphs[end_pos].count;
		}
	}
	int space_count = 0;
	int elongation_count = 0;
	for (int i = start_pos; i <= end_pos; i++) {
		const Glyph &gl = sd->glyphs[i];
		if (gl.count > 0) {
			if ((gl.flags & GRAPHEME_IS_ELONGATION) == GRAPHEME_IS_ELONGATION) {
				if ((i > 0) && ((sd->glyphs[i - 1].flags & GRAPHEME_IS_ELONGATION) != GRAPHEME_IS_ELONGATION)) {
					
					elongation_count++;
				}
			}
			if ((gl.flags & GRAPHEME_IS_SPACE) == GRAPHEME_IS_SPACE && (gl.flags & GRAPHEME_IS_PUNCTUATION) != GRAPHEME_IS_PUNCTUATION) {
				space_count++;
			}