_DeselectAll
bool _DeselectAll(int32 exceptFrom, int32 exceptTo);
_DeselectAll(-1, -1);
if (_DeselectAll(-1, -1)) {
if (_DeselectAll(exceptFrom, exceptTo)) {
if (_DeselectAll(-1, -1)) {
changed = _DeselectAll(index, index);
changed = _DeselectAll(from, to);