What am I doing wrong? Any idea / hint would be extremely helpful!

Lets look at the error 

gtk_tree_store_get_path:
assertion
'iter->stamp == tree_store->stamp'
failed

[download]

So we're dealing with an "get_path" and "iter" and a "store"

So in your code my ($_tree_store, $path, $pattern, $iter) = @_; ...

And you have 

my $path = $new_treestore->get_path( $new_treestore->get_iter_first() 
+);

[download]

Next step would be look up the documentation for gtk_tree_store_get_path and look for examples to see what it wants (its clearly not get_iter_first() )

Maybe check your Gtk...versions against bug reports regarding this

In reply to Re: Gtk2::TreeStore problem ( gtk_tree_store_get_path: assertion 'iter->stamp == tree_store->stamp' ) by Anonymous Monk
in thread Gtk2::TreeStore problem by insaniac

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