I’ve found 2 ways of converting from an old GTK+ UI xml format (using Libglade) to the new format (using the built-in GtkBuilder). One is using Glade 3 Interface Builder (Save As button), and another is using gtk-builder-convert. They give different outputs, so I would like to know which one to trust more.
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It seems that
gtk-builder-convertis less buggy than the two. Glade 3 screws up the xml output even when making a small edit without even doing a convert (Saving to old glade format).