Follow-up Comment #13, bug #60602 (project groff):
[comment #10 comment #10:]
> CSTR 54 is correct. Branden's 'guess' is wrong and no change from Bell Labs
troff's normal and documented behaviour should be made based on it. vflag is
used to indicate the motion is vertical. It is nothing to do with forcing a
unit calculation to be vees. The code of makem(), quoted but not analysed
above, makes this clear.
443 makem(i)
444 int i;
445 {
446 register j;
447
448 if((j = i) < 0)j = -j;
449 j = (j & ~MOTV) | MOT;
450 if(i < 0)j |= NMOT;
451 if(vflag)j |= VMOT;
452 return(j);
453 }
https://www.youtube.com/watch?v=KmKOVdAGtzM
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