564     auto *LinksFrom = &linksAt(Idx2);  in mergeDirect()  local
567     while (LinksInto->hasAbove() && LinksFrom->hasAbove()) {  in mergeDirect()
569       LinksFrom = &linksAt(LinksFrom->getAbove());  in mergeDirect()
572     if (LinksFrom->hasAbove()) {  in mergeDirect()
573       LinksInto->setAbove(LinksFrom->getAbove());  in mergeDirect()
584     while (LinksInto->hasBelow() && LinksFrom->hasBelow()) {  in mergeDirect()
585       auto &FromAttrs = LinksFrom->getAttrs();  in mergeDirect()
590       auto *NewLinksFrom = &linksAt(LinksFrom->getBelow());  in mergeDirect()
591       LinksFrom->remapTo(LinksInto->Number);  in mergeDirect()
592       LinksFrom = NewLinksFrom;  in mergeDirect()
596     if (LinksFrom->hasBelow()) {  in mergeDirect()
597       LinksInto->setBelow(LinksFrom->getBelow());  in mergeDirect()
602     LinksFrom->remapTo(LinksInto->Number);  in mergeDirect()