### 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.
Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (int i = 0; i < caret_edit_order.size() - 1; i++) {
		int first_caret = caret_edit_order[i];
		int second_caret = caret_edit_order[i + 1];
		
		if (has_selection(first_caret) && has_selection(second_caret)) {
			bool should_merge = false;
			if (get_selection_from_line(first_caret) >= get_selection_from_line(second_caret) && get_selection_from_line(first_caret) <= get_selection_to_line(second_caret) && (get_selection_from_line(first_caret) > get_selection_from_line(second_caret) || get_selection_from_column(first_caret) >= get_selection_from_column(second_caret)) && (get_selection_from_line(first_caret) < get_selection_to_line(second_caret) || get_selection_from_column(first_caret) <= get_selection_to_column(second_caret))) {
				should_merge = true;
			}
			if (get_selection_to_line(first_caret) >= get_selection_from_line(second_caret) && get_selection_to_line(first_caret) <= get_selection_to_line(second_caret) && (get_selection_to_line(first_caret) > get_selection_from_line(second_caret) || get_selection_to_column(first_caret) >= get_selection_from_column(second_caret)) && (get_selection_to_line(first_caret) < get_selection_to_line(second_caret) || get_selection_to_column(first_caret) <= get_selection_to_column(second_caret))) {
				should_merge = true;
			}
			if (!should_merge) {
				continue;
			}
			
			int caret_to_save = first_caret;
			int caret_to_remove = second_caret;
			if (first_caret < second_caret) {
				caret_to_save = second_caret;
				caret_to_remove = first_caret;
			}
			int from_line = MIN(get_selection_from_line(caret_to_save), get_selection_from_line(caret_to_remove));
			int to_line = MAX(get_selection_to_line(caret_to_save), get_selection_to_line(caret_to_remove));
			int from_col = get_selection_from_column(caret_to_save);