I want to show some GTK icon in the Notebook Label (for pinned tab),
where is no method available like this one for Button widget:
How can I do that natively or with minimal acts, without packing image into the Box widget, etc?
You can use any widget with gtk_notebook_set_tab_label(), not just labels.
I’ve just created some extra features for the Label one, now thinking how to append just image there, without rewriting parental logic 