### 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.
ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	if (!is_line_wrapped(p_line)) {
		return 0;
	}
	return text.get_line_wrap_amount(p_line);
}
int TextEdit::get_line_wrap_index_at_column(int p_line, int p_column) const {
	ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	ERR_FAIL_COND_V(p_column < 0, 0);
	ERR_FAIL_COND_V(p_column > text[p_line].length(), 0);
	if (!is_line_wrapped(p_line)) {
		return 0;
	}
	
	int wrap_index = 0;
	int col = 0;
	Vector<String> lines = get_line_wrapped_text(p_line);
	for (int i = 0; i < lines.size(); i++) {
		wrap_index = i;
		String s = lines[wrap_index];
		col += s.length();
		if (col > p_column) {
			break;
		}
	}
	return wrap_index;
}
Vector<String> TextEdit::get_line_wrapped_text(int p_line) const {