gtk:tree-view-visible-range (view)

view -- a gtk:tree-view widget

start -- a gtk:tree-path instance with the start of region, or nil
end -- a gtk:tree-path instance with the end of region, or nil

Returns start and end to be the first and last visible path. Note that there may be invisible paths in between. The gtk:tree-view implementation is deprecated since 4.10. Please do not use it in newly written code.