[bug #64354] [troff] discourage or reject use of 'F' drawing command

[Deri James]

Follow-up Comment #1, bug #64354 (project groff):

I like this feature and have used it in my software which generates troff
output from other sources. It's advantage is that it does not clutter up name
space for a colour which may be used only once.

Also, it seems to be used in our own documents:-

[derij@pip build (new-gropdf)]$ ./pic ../doc/pic.ms | fgrep "\D'F" | ct
\&\D'Fg 0.100'  1
\&\D'Fg 0.600'  1
\&\D'Fg 0.500'  6
\&\D'Fg 1.000'  8
\&\D'Fg 0.000'  26
Total   42

I suppose if our normal 20+ years for deprecation is used, I won't be here.
:-)

Also, you don't explain why you consider this a layering volation, when all
other \D'x' result in Dx output as well. The other colour controls all deal in
colour names, but if you want to compute a colour this is the boy for you, it
serves a different purpose.


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