### 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)
}
	}
	int32_t dot_gl_idx = dot_gl_font_rid.is_valid() ? _font_get_glyph_index(dot_gl_font_rid, last_gl_font_size, '.', 0) : -10;
	Vector2 dot_adv = dot_gl_font_rid.is_valid() ? _font_get_glyph_advance(dot_gl_font_rid, last_gl_font_size, dot_gl_idx) : Vector2();
	int32_t whitespace_gl_idx = whitespace_gl_font_rid.is_valid() ? _font_get_glyph_index(whitespace_gl_font_rid, last_gl_font_size, ' ', 0) : -10;
	Vector2 whitespace_adv = whitespace_gl_font_rid.is_valid() ? _font_get_glyph_advance(whitespace_gl_font_rid, last_gl_font_size, whitespace_gl_idx) : Vector2();
	int ellipsis_width = 0;
	if (add_ellipsis && whitespace_gl_font_rid.is_valid()) {
		ellipsis_width = 3 * dot_adv.x + sd->extra_spacing[SPACING_GLYPH] + _font_get_spacing(dot_gl_font_rid, SPACING_GLYPH) + (cut_per_word ? whitespace_adv.x : 0);
	}
	int ell_min_characters = 6;
	double width = sd->width;
	bool is_rtl = sd->para_direction == DIRECTION_RTL;
	int trim_pos = (is_rtl) ? sd_size : 0;
	int ellipsis_pos = (enforce_ellipsis) ? 0 : -1;
	int last_valid_cut = 0;
	bool found = false;
	int glyphs_from = (is_rtl) ? 0 : sd_size - 1;
	int glyphs_to = (is_rtl) ? sd_size - 1 : -1;
	int glyphs_delta = (is_rtl) ? +1 : -1;
	if (enforce_ellipsis && (width + ellipsis_width <= p_width)) {
		trim_pos = -1;
		ellipsis_pos = (is_rtl) ? 0 : sd_size;
	} else {
		for (int i = glyphs_from; i != glyphs_to; i += glyphs_delta) {
			if (!is_rtl) {
				width -= sd_glyphs[i].advance * sd_glyphs[i].repeat;
			}
			if (sd_glyphs[i].count > 0) {
				bool above_min_char_threshold = ((is_rtl) ? sd_size - 1 - i : i) >= ell_min_characters;