Whitespace is significant inside \D'...'

[nbuwe]

troff seems to insist on parameters inside \D'...' separated with exactly one space. This precludes visual alignment in code like, e.g.:

\" 60 degrees segment on the left
\D'l -.87i -.5i'\
\D'a  .87i  .5i \
     -.87i  .5i'\
\D'l  .87i -.5i'

which, arguably, makes it a bit more readable.

It would be nice to support flexible whitespace here (groff does).

[n-t-roff]

Thank you for reporting.