### 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 (add_ellipsis && (ellipsis_pos > 0 || enforce_ellipsis)) {
			
			if (cut_per_word && (ellipsis_pos > 0)) {
				Glyph gl;
				gl.count = 1;
				gl.advance = whitespace_adv.x;
				gl.index = whitespace_gl_idx;
				gl.font_rid = whitespace_gl_font_rid;
				gl.font_size = last_gl_font_size;
				gl.flags = GRAPHEME_IS_SPACE | GRAPHEME_IS_BREAK_SOFT | GRAPHEME_IS_VIRTUAL | (is_rtl ? GRAPHEME_IS_RTL : 0);
				sd->overrun_trim_data.ellipsis_glyph_buf.append(gl);
			}
			
			if (dot_gl_idx != 0) {
				Glyph gl;
				gl.count = 1;
				gl.repeat = 3;
				gl.advance = dot_adv.x;
				gl.index = dot_gl_idx;
				gl.font_rid = dot_gl_font_rid;
				gl.font_size = last_gl_font_size;
				gl.flags = GRAPHEME_IS_PUNCTUATION | GRAPHEME_IS_VIRTUAL | (is_rtl ? GRAPHEME_IS_RTL : 0);
				sd->overrun_trim_data.ellipsis_glyph_buf.append(gl);
			}
		}
		sd->text_trimmed = true;
		sd->width_trimmed = width + ((ellipsis_pos != -1) ? ellipsis_width : 0);
	}
}
int64_t TextServerAdvanced::_shaped_text_get_trim_pos(const RID &p_shaped) const {