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In fact there were two issues: 1. GtkFlowBoxChild with "can-focus"==FALSE should pass the focus to its child immediately. 2. GtkFlowBox with "can-focus"==FALSE should cease its custom keynav implementation and fall back to the default GtkContainer behavior which is more natural. Thanks to these changes the flow box can act as a better replacement for GtkGrid and similar containers. https://bugzilla.gnome.org/show_bug.cgi?id=753371
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