[Eric] font settings shift when saving a new file

[Darren Dale]

Hello,

When I create a new file, the fonts initially respect the settings from the 
preferences dialog, which is DejaVu Sans Mono (same font for all eric4's 
fonts, and I have the "use monospace as default" box checked). When I save 
this new file (as .py or .c, for example), the fonts change from monospaced 
to some kind of sans serif. If I close the file and reopen it, I get the 
monospaced fonts back.

Its a minor issue, but its been around for as long as I can remember. I 
probably should have reported it earlier. I'm currently using the 4.2 release 
candidate.

Darren