### 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
ERR_FAIL_COND(p_caret > carets.size());
	if (!editable) {
		return;
	}
	if (has_selection(p_caret)) {
		delete_selection(p_caret);
		return;
	}
	begin_complex_operation();
	Vector<int> caret_edit_order = get_caret_index_edit_order();