As far as I understand, a property value that you specify with \override
is stored in the context and copied to a layout object when it is created.
Once the layout object has been created, you cannot change any property
value using \override. \overrideProperty, on the other hand, allows you to
cha
What are the `technical reasons' for using \overrideProperty for some
grobs like PaperColumn, instead of \override?
Han-Wen says that \override, applied to PaperColumn, always happens
one timestep late. Can this be avoided with \overrideProperty?
Werner
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