### 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)
wr[ofs + 1] = (bitmap.buffer[byte] & bit) ? 255 : 0;
					} 
					case FT_PIXEL_MODE_GRAY:
						wr[ofs + 0] = 255; 
						wr[ofs + 1] = bitmap.buffer[i * bitmap.pitch + j];
						
					case FT_PIXEL_MODE_BGRA: {
						int ofs_color = i * bitmap.pitch + (j << 2);
						wr[ofs + 2] = bitmap.buffer[ofs_color + 0];
						wr[ofs + 1] = bitmap.buffer[ofs_color + 1];
						wr[ofs + 0] = bitmap.buffer[ofs_color + 2];
						wr[ofs + 3] = bitmap.buffer[ofs_color + 3];
					} 
					case FT_PIXEL_MODE_LCD: {
						int ofs_color = i * bitmap.pitch + (j * 3);
						if (p_bgra) {
							wr[ofs + 0] = bitmap.buffer[ofs_color + 0];
							wr[ofs + 1] = bitmap.buffer[ofs_color + 1];
							wr[ofs + 2] = bitmap.buffer[ofs_color + 2];
							wr[ofs + 3] = 255;
						} else {
							wr[ofs + 0] = bitmap.buffer[ofs_color + 2];
							wr[ofs + 1] = bitmap.buffer[ofs_color + 1];
							wr[ofs + 2] = bitmap.buffer[ofs_color + 0];
							wr[ofs + 3] = 255;
						}
					} 
					case FT_PIXEL_MODE_LCD_V: {
						int ofs_color = i * bitmap.pitch * 3 + j;
						if (p_bgra) {