### 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)
case FONT_LCD_SUBPIXEL_LAYOUT_VBGR: {
						aa_mode = FT_RENDER_MODE_LCD_V;
						bgra = true;
					} 
					default: {
						aa_mode = FT_RENDER_MODE_NORMAL;
					} 
				}
			} 
		}
		if (!outline) {
			if (!p_font_data->msdf) {
				error = FT_Render_Glyph(fd->face->glyph, aa_mode);
			}
			FT_GlyphSlot slot = fd->face->glyph;
			if (!error) {
				if (p_font_data->msdf) {
#ifdef MODULE_MSDFGEN_ENABLED
					gl = rasterize_msdf(p_font_data, fd, p_font_data->msdf_range, rect_range, &slot->outline, Vector2((h + (1 << 9)) >> 10, (v + (1 << 9)) >> 10) / 64.0);
#else
					fd->glyph_map[p_glyph] = FontGlyph();
					ERR_FAIL_V_MSG(false, "Compiled without MSDFGEN support!");
#endif
				} else {
					gl = rasterize_bitmap(fd, rect_range, slot->bitmap, slot->bitmap_top, slot->bitmap_left, Vector2((h + (1 << 9)) >> 10, (v + (1 << 9)) >> 10) / 64.0, bgra);
				}
			}
		} else {
			FT_Stroker stroker;
			if (FT_Stroker_New(ft_library, &stroker) != 0) {