the position to determine the destination row for
the position to determine the destination row for
Return location for the path of the highlighted row, or %NULL.
Return location for the drop position, or %NULL
Return: whether there is a row at the given position, %TRUE if this is indeed the case.
Determines the destination row for a given position. @drag_x and @drag_y are expected to be in widget coordinates. This function is only meaningful if @tree_view is realized. Therefore this function will always return %FALSE if @tree_view is not realized or does not have a model.