rem: void KMFolder::setChild( KMFolderDir* aChild ) { mChild = aChild; mStorage->updateChildrenState(); }
add: virtual void setChild( KMFolderDir* aChild ) { mChild = aChild; }
context: void KMFolder::setChild( KMFolderDir* aChild ){  mChild = aChild;  mStorage->updateChildrenState();}