// there's new/deleted imageLink betwen note and its image child - which can show/hide
// the image (if there is a imageLink relation between parent and child then it is assumed to be "contained" in the note and thus does not have to be displayed in the tree)
// the image (if there is a imageLink relation between parent and child
// then it is assumed to be "contained" in the note and thus does not have to be displayed in the tree)