use default expansion state for TOC when document is unlocked, because it was not shown before
use default expansion state for TOC when document is unlocked, because it was not shown before
WoLpH/skim,ycaihua/skim-app,ycaihua/skim-app,WoLpH/skim,ycaihua/skim-app,WoLpH/skim,ycaihua/skim-app,WoLpH/skim,ycaihua/skim-app,WoLpH/skim