### Godot version

4.0.2.stable.official [7a0977ce2]

### System information

Windows 10

### Issue description

LineEdit node with enabled "expand_to_text_length" option and "minimum_character_width = 0" and cleared margins in style overrides still has some empty space inside
![node](https://github.com/godotengine/godot/assets/23380802/86c79678-8422-4a98-8406-602edd7dc48b)
![node settings](https://github.com/godotengine/godot/assets/23380802/11d04d71-bbf1-4c16-8155-fe39b5bbd66b)
![style overrides](https://github.com/godotengine/godot/assets/23380802/6b3c3925-b4bd-455b-aac1-ddeb54a4d796)


### Steps to reproduce

1. Add LineEdit node
2. Set expand_to_text_length = true
3. Set minimum_character_width in theme overrides = 0
4. Set normal to StyleBoxEmpty


### Minimal reproduction project

[LineEdit can't be zero sized.zip](https://github.com/godotengine/godot/files/11566017/LineEdit.can.t.be.zero.sized.zip)

caret = TS->shaped_text_get_carets(text_rid, caret_column + ime_selection.x);
	} else {
		caret = TS->shaped_text_get_carets(text_rid, caret_column);
	}
	if ((caret.l_caret != Rect2() && (caret.l_dir == TextServer::DIRECTION_AUTO || caret.l_dir == (TextServer::Direction)input_direction)) || (caret.t_caret == Rect2())) {
		ret.x = x_ofs + caret.l_caret.position.x + scroll_offset;
	} else {
		ret.x = x_ofs + caret.t_caret.position.x + scroll_offset;
	}
	
	if (ime_text.length() != 0) {
		if (ime_selection.y != 0) {
			caret = TS->shaped_text_get_carets(text_rid, caret_column + ime_selection.x + ime_selection.y);
		} else {
			caret = TS->shaped_text_get_carets(text_rid, caret_column + ime_text.size());
		}
		if ((caret.l_caret != Rect2() && (caret.l_dir == TextServer::DIRECTION_AUTO || caret.l_dir == (TextServer::Direction)input_direction)) || (caret.t_caret == Rect2())) {
			ret.y = x_ofs + caret.l_caret.position.x + scroll_offset;
		} else {
			ret.y = x_ofs + caret.t_caret.position.x + scroll_offset;
		}
	} else {
		ret.y = ret.x;
	}
	return ret;
}
void LineEdit::set_caret_mid_grapheme_enabled(const bool p_enabled) {
	caret_mid_grapheme_enabled = p_enabled;
}
bool LineEdit::is_caret_mid_grapheme_enabled() const {