Paragraphs in groff source

Hello all,

I am using Vim to edit groff (GNU Troff) code, where
formatting requests are denoted by a dot at the
start of a line. Although Vim has the 'paragraphs'
optiion, it is only useful for selecting paragraphs
and moving the around, but not for reformatting them
using the 'gq' command, because all non-paragraph
formatting requests like '.I' (italic font) are
treated as simple text and are moved away from the
beginning of the line and intermixed with the pre-
ceeding and following text.

In other words, the rules for separating paragraphs
should be different for reformatting text and for
logical manipulation, because a paragraph may
include many formatting requests which are not
listed in &paragraphs and should not be affected by
'gq'.

Could you suggest a way to implement this in Vim?

Thanks in advance,
Anton

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