I created some example code to explain the problem.

Maybe I miss something like a item-draw-event?

https://gist.github.com/noMICROSOFTbuhtz/ec14bd66cd8b1e0719c4197f8a58d60f

On 2019-02-14 11:17 <c.bu...@posteo.jp> wrote:
> Mystic...
> mytree.get_visible_range()
> returns always None no matter how much rows are in it.
> 
> Why?
> 
> On 2019-02-14 10:21 "c.buhtz--- via python-hackers-list"
> <python-hackers-list@gnome.org> wrote:
> > The documentation about Gtk.TreeView.get_visible_range() says:
> > 
> > "Returns the first and last visible path. Note that there may be
> > invisible paths in between."
> > <https://lazka.github.io/pgi-docs/#Gtk-3.0/classes/TreeView.html#Gtk.TreeView.get_visible_range>
> > 
> > I have stomachache about the fact that there could be "invisible
> > paths in between". But the documentation here keeps mystic.
> > Why is it so? In which cases are there invisible paths?
> > 
> > I need to prevent this situations.
> > _______________________________________________
> > python-hackers-list mailing list
> > python-hackers-list@gnome.org
> > https://mail.gnome.org/mailman/listinfo/python-hackers-list  
> 

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