### 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)
ShapedTextDataAdvanced *sd = shaped_owner.get_or_null(p_shaped_line);
	ERR_FAIL_COND_MSG(!sd, "ShapedTextDataAdvanced invalid.");
	MutexLock lock(sd->mutex);
	if (!sd->valid) {
		_shaped_text_shape(p_shaped_line);
	}
	sd->text_trimmed = false;
	sd->overrun_trim_data.ellipsis_glyph_buf.clear();
	bool add_ellipsis = p_trim_flags.has_flag(OVERRUN_ADD_ELLIPSIS);
	bool cut_per_word = p_trim_flags.has_flag(OVERRUN_TRIM_WORD_ONLY);
	bool enforce_ellipsis = p_trim_flags.has_flag(OVERRUN_ENFORCE_ELLIPSIS);
	bool justification_aware = p_trim_flags.has_flag(OVERRUN_JUSTIFICATION_AWARE);
	Glyph *sd_glyphs = sd->glyphs.ptrw();
	if ((p_trim_flags & OVERRUN_TRIM) == OVERRUN_NO_TRIM || sd_glyphs == nullptr || p_width <= 0 || !(sd->width > p_width || enforce_ellipsis)) {
		sd->overrun_trim_data.trim_pos = -1;
		sd->overrun_trim_data.ellipsis_pos = -1;
		return;
	}
	if (justification_aware && !sd->fit_width_minimum_reached) {
		return;
	}