Default Font is not saved when changing buffers.

[Christopher Eliot <CRE at SANCHO-PANZA>]

In Symbolics 3600 ZWEI in System 242.356, Hardcopy 20.10,
Experimental Xqsim 33.0, FEP 18, on Lisp Machine Sancho Panza:

Changing buffers resets the default font from its current value
to the first one in the font-map.  This is lossage.  The default font
should be remembered on a buffer by buffer basis and restored to 
its previous value when you re-select a buffer. 

Chris