### 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 (get_caret_count() > 1) {
		remove_secondary_carets();
		return true;
	}
	if (has_selection()) {
		deselect();
		return true;
	}
	return false;
}
void TextEdit::_get_above_below_caret_line_column(int p_old_line, int p_old_wrap_index, int p_old_column, bool p_below, int &p_new_line, int &p_new_column, int p_last_fit_x) const {
	if (p_last_fit_x == -1) {
		p_last_fit_x = _get_column_x_offset_for_line(p_old_column, p_old_line, p_old_column);
	}
	
	p_new_line = p_old_line;
	int caret_wrap_index = p_old_wrap_index;
	if (p_below) {
		if (caret_wrap_index < get_line_wrap_count(p_new_line)) {
			caret_wrap_index++;
		} else {
			p_new_line++;