### Godot version

4.0 beta 15

### System information

Windows 10

### Issue description

It happened with both Google IME and MS-IME, and there was no problem until Beta14.
When typing Japanese characters, it is common to select a character from the suggestion window and then start typing the next character before confirming.
In this case, uncommitted characters are forcibly committed, and input of the next character begins.

**↓Beta15**

https://user-images.githubusercontent.com/186786/214753450-b493cca6-2644-4b3d-8cd2-660565cc3547.mp4

**↓Beta14**

https://user-images.githubusercontent.com/186786/214755127-dde819cc-4d63-403a-99b0-09821671f74e.mp4



### Steps to reproduce

It happened with both Google IME and MS-IME in beta15

### Minimal reproduction project

It is project independent and happens in the editor.
CaretInfo caret;
	
	if (ime_text.length() != 0 && ime_selection.x != 0) {
		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) {