[Gtk-sharp-list] Sorting a TreeView with a filter

[ThinkDave]

I know this thread is old but I came across it so many times when I was
trying to solve this exact problem so to save another helpless googler ill
add the answer.

Gtk.TreeModelFilter filter;
Gtk.TreeModelSort filter_sort;
filter = new Gtk.TreeModelFilter(taskListStore, null);
filter_sort = new Gtk.TreeModelSort(filter);
filter.VisibleFunc = new Gtk.TreeModelFilterVisibleFunc (FilterTree);
taskListTreeView.Model = filter_sort;
filter.Refilter ();

You have to wrap the filter in a TreeModelSort then use the result as the
model for the TreeView.

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