Support for GTK4 tree views

[chriskilding]

Are GTK4 tree views supported in Relm4 (e.g. in TypedListView)? If so, are there any examples?

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Side note: it appears that tree views have changed a bit since the GTK3 GtkTreeView (which is now deprecated).

More details at https://blog.gtk.org/2020/06/08/more-on-lists-in-gtk-4/

[AaronErhardt]

There are no enhancements added by Relm4 (such as TypedListView) and there no plan to add those because it's already deprecated, but if you want to use them, you can still use regular gtk-rs code.

[chriskilding]

Ah, not that exactly. I'm not trying to use the deprecated GtkTreeView. I'm interested in using the GTK4 way - GtkTreeListModel (the data model), GtkTreeExpander (the UI widget that renders a tree model with tree-style expander buttons and indentation), and so on.

[AaronErhardt]

Sure, if someone sends a PR to add something like TypedTreeExpander, I'd be happy to merge that.