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GTK 4 has a number of new features that you may want to take advantage of once the dust has settled over the initial migration.
In GTK 2 and 3, GtkTreeModel and GtkCellRenderer and widgets using these were the primary way of displaying data and lists. GTK 4 brings a new family of widgets for this purpose that uses list models instead of tree models, and widgets instead of cell renderers.
To learn more about the new list widgets, you can read the List Widget Overview.