563     auto *LinksInto = &linksAt(Idx1);  in mergeDirect()  local
567     while (LinksInto->hasAbove() && LinksFrom->hasAbove()) {  in mergeDirect()
568       LinksInto = &linksAt(LinksInto->getAbove());  in mergeDirect()
573       LinksInto->setAbove(LinksFrom->getAbove());  in mergeDirect()
574       auto &NewAbove = linksAt(LinksInto->getAbove());  in mergeDirect()
575       NewAbove.setBelow(LinksInto->Number);  in mergeDirect()
584     while (LinksInto->hasBelow() && LinksFrom->hasBelow()) {  in mergeDirect()
586       LinksInto->setAttrs(FromAttrs);  in mergeDirect()
591       LinksFrom->remapTo(LinksInto->Number);  in mergeDirect()
593       LinksInto = &linksAt(LinksInto->getBelow());  in mergeDirect()
597       LinksInto->setBelow(LinksFrom->getBelow());  in mergeDirect()
598       auto &NewBelow = linksAt(LinksInto->getBelow());  in mergeDirect()
599       NewBelow.setAbove(LinksInto->Number);  in mergeDirect()
602     LinksFrom->remapTo(LinksInto->Number);  in mergeDirect()