GtkBox: bad allocation with center child and homogeneous property set
GtkBox does not allocate children properly if homogeneous is set, have a center child and no pack end child.
See #1069 (closed) first
Gtk-WARNING **: 11:19:02.636: Negative content height -9 (allocation 1, extents 5x5) while allocating gadget (node button, owner GtkButton)