### Godot version

v4.0.beta.custom_build [13f0158]

### System information

Windows 10

### Issue description

When doing operations (`begin_complex_operation` and `end_complex_operation`) with multiple selections in TextEdit, some of these selections don't revert upon undo. This behavior is affects some of script editor's operations, like duplicate selection and delete lines.

### Steps to reproduce

Open script editor, make multiple selections. Keep in mind what you have selected. Do duplicate selection (ctrl+shift+D). Undo (ctrl+Z). Compare the result to what you remember.

### Minimal reproduction project

N/A
for (int i = 0; i < carets.size(); i++) {
		
		if (p_select) {
			_pre_shift_selection(i);
		} else if (has_selection(i) && !p_move_by_word) {
			
			set_caret_line(get_selection_to_line(i), false, true, 0, i);
			set_caret_column(get_selection_to_column(i), i == 0, i);
			deselect(i);
			continue;
		} else {
			deselect(i);
		}
		if (p_move_by_word) {
			int cc = get_caret_column(i);
			
			if (cc == text[get_caret_line(i)].length() && get_caret_line(i) < text.size() - 1) {
				set_caret_line(get_caret_line(i) + 1, false, true, 0, i);
				set_caret_column(0, i == 0, i);
			} else {
				PackedInt32Array words = TS->shaped_text_get_word_breaks(text.get_line_data(get_caret_line(i))->get_rid());
				if (words.is_empty() || cc >= words[words.size() - 1]) {
					
					cc = text[get_caret_line(i)].length();
				} else {
					for (int j = 1; j < words.size(); j = j + 2) {