GtkLayoutManagerClass->allocate() never receives a baseline

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I have a widget that relies on its own GtkLayoutManager. The parent – also a custom widget – allocates this widget using gtk_widget_allocate(), requesting a baseline > -1. I expect that gtk_widget_allocate() passes the requested baseline to the child’s GtkLayoutManagerClass->allocate() function, however that is not the case and the latter always receives -1.

What might be missing?

Update (problem solved): My bad. The only problem was that I was forgetting to set the vertical alignment ("valign") of the child to GTK_ALIGN_BASELINE_FILL.

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