### 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 (width + (((above_min_char_threshold && add_ellipsis) || enforce_ellipsis) ? ellipsis_width : 0) <= p_width) {
					if (cut_per_word && above_min_char_threshold) {
						if ((sd_glyphs[i].flags & GRAPHEME_IS_BREAK_SOFT) == GRAPHEME_IS_BREAK_SOFT) {
							last_valid_cut = i;
							found = true;
						}
					} else {
						last_valid_cut = i;
						found = true;
					}
					if (found) {
						trim_pos = last_valid_cut;
						if (add_ellipsis && (above_min_char_threshold || enforce_ellipsis) && width - ellipsis_width <= p_width) {
							ellipsis_pos = trim_pos;
						}
						
					}
				}
			}
			if (is_rtl) {
				width -= sd_glyphs[i].advance * sd_glyphs[i].repeat;
			}
		}
	}
	sd->overrun_trim_data.trim_pos = trim_pos;
	sd->overrun_trim_data.ellipsis_pos = ellipsis_pos;
	if (trim_pos == 0 && enforce_ellipsis && add_ellipsis) {
		sd->overrun_trim_data.ellipsis_pos = 0;
	}
	if ((trim_pos >= 0 && sd->width > p_width) || enforce_ellipsis) {