### 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 (cl == 0 && get_line_count() > 1) {
			_remove_text(cl, 0, cl + 1, 0);
			adjust_carets_after_edit(caret_idx, cl, 0, cl + 1, text[cl].length());
		} else {
			_remove_text(cl, 0, cl, text[cl].length());
			set_caret_column(0, false, caret_idx);
			backspace(caret_idx);
			set_caret_line(get_caret_line(caret_idx) + 1, caret_idx == 0, 0, 0, caret_idx);
		}
		
		int diff_indent = indent_level - get_indent_level(get_caret_line(caret_idx));
		cc += diff_indent;
		if (diff_indent != 0) {
			cc += diff_indent > 0 ? -1 : 1;
		}
		
		set_h_scroll(hscroll);
		set_caret_column(cc, caret_idx == 0, caret_idx);
	}
	
	carets_to_remove.sort();
	for (int i = carets_to_remove.size() - 1; i >= 0; i--) {
		remove_caret(carets_to_remove[i]);
	}
	end_complex_operation();
	String clipboard_string = clipboard.as_string();
	DisplayServer::get_singleton()->clipboard_set(clipboard_string);
	cut_copy_line = clipboard_string;
}
void TextEdit::_copy_internal(int p_caret) {