### 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(p_at, text.size());
	_insert_text(p_at, 0, p_text + "\n");
	for (int i = 0; i < carets.size(); i++) {
		if (get_caret_line(i) >= p_at) {
			
			set_caret_line(get_caret_line(i) + 1, false, true, 0, i);
		}
		if (has_selection(i)) {
			if (get_selection_from_line(i) >= p_at) {
				
				select(get_selection_from_line(i) + 1, get_selection_from_column(i), get_selection_to_line(i) + 1, get_selection_to_column(i), i);
			} else if (get_selection_to_line(i) >= p_at) {
				
				select(get_selection_from_line(i), get_selection_from_column(i), get_selection_to_line(i) + 1, get_selection_to_column(i), i);
			}
		}
	}
	
	current_op.end_carets = carets;
	queue_redraw();
}
void TextEdit::insert_text_at_caret(const String &p_text, int p_caret) {