### 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.
if (!tooltip_callback.is_valid()) {
		return Control::get_tooltip(p_pos);
	}
	Point2i pos = get_line_column_at_pos(p_pos);
	int row = pos.y;
	int col = pos.x;
	String s = text[row];
	if (s.length() == 0) {
		return Control::get_tooltip(p_pos);
	}
	int beg, end;
	if (select_word(s, col, beg, end)) {
		Variant args[1] = { s.substr(beg, end - beg) };
		const Variant *argp[] = { &args[0] };
		Callable::CallError ce;
		Variant ret;
		tooltip_callback.callp(argp, 1, ret, ce);
		ERR_FAIL_COND_V_MSG(ce.error != Callable::CallError::CALL_OK, "", "Failed to call custom tooltip.");
		return ret;
	}
	return Control::get_tooltip(p_pos);
}
void TextEdit::set_tooltip_request_func(const Callable &p_tooltip_callback) {