Is there a global way to insert a very thin (ca 1pt) unbreakable space
before a right guillemet and after a left guillemet when the main language
and character spacing are English, so that “«” and “»” in my source
file are processed properly?
The font that I am using puts them too close to the enclosed characters
(typically, Greek). Basically, I need to borrow the French spacing for
these two characters but have not been able to figure out how to do this
from the ConTeXt source files.