switching colschemes may lose font setting

[sven <sv...@ap...>]

Seems that switching colour schemes may lose font preferences. I have my 
font set to Courier New and colour scheme to Zenburn (or any other which 
doesn't imply its own font). When I switch to scheme that uses different 
font, "toothpik" for example (highlight Normal guibg=grey 
font='Fixedsys') then switching back to any other normal scheme does not 
bring back my preferred font. I don't think that colour schemes should 
force their own font anyway and I'm perfectly happy to fix that myself. 
Just thought to report the behaviour.

sven