### 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.
int caret_idx = caret_edit_order[i];
		if (has_selection(caret_idx)) {
			delete_selection(caret_idx);
			continue;
		}
		int curline_len = text[get_caret_line(caret_idx)].length();
		if (get_caret_line(caret_idx) == text.size() - 1 && get_caret_column(caret_idx) == curline_len) {
			continue; 
		}
		int next_line = get_caret_column(caret_idx) < curline_len ? get_caret_line(caret_idx) : get_caret_line(caret_idx) + 1;
		int next_column;
		if (p_all_to_right) {
			
			for (int j = i + 1; j < caret_edit_order.size(); j++) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (has_selection(caret_edit_order[j]) && get_selection_from_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (!has_selection(caret_edit_order[j])) {
					i = j;
					caret_idx = caret_edit_order[i];
				}
			}
			if (get_caret_column(caret_idx) == curline_len) {
				continue;
			}
			
			next_column = curline_len;