> keybuf = gtk_entry_buffer_new ("Not yet generated", 45);

https://developer.gnome.org/gtk3/stable/GtkEntryBuffer.html#gtk-entry-buffer-new

The second parameter of gtk_entry_buffer_new() specifies the number of
characters in the string.

Either change 45 to 17 or to -1.

Best regards,
Norbert
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