Returns the index into the list of siblings for the element at pos as returned by Widget.pathIterGetSiblings. If that function would return NULL because the element at pos has no siblings, this function will return 0.
position to get the sibling index for, -1 for the path head
0 or the index into the list of siblings for the element at pos.
Returns the index into the list of siblings for the element at pos as returned by Widget.pathIterGetSiblings. If that function would return NULL because the element at pos has no siblings, this function will return 0.