[bug #65961] [grohtml] pre-html.cpp: suppress certain warnings from pnmcrop

[G. Branden Robinson]

Update of bug #65961 (group groff):

                  Status:                   Fixed => None                   
             Open/Closed:                  Closed => Open                   
         Planned Release:                  1.24.0 => None                   

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Follow-up Comment #6:

Reopening.

Going to have to revert this.  I've finally managed to determine that it's
complaining about a real problem.

In a build I just did:


/home/branden/bin/harry-manback: groff_me.7
troff:./groff_me.7:188: error: suppression limit registers span more than a
page; grohtml-info for image 1 will be wrong
troff:./groff_me.7:339: error: suppression limit registers span more than a
page; grohtml-info for image 2 will be wrong
troff:./groff_me.7:370: error: suppression limit registers span more than a
page; grohtml-info for image 3 will be wrong
troff:./groff_me.7:436: error: suppression limit registers span more than a
page; grohtml-info for image 4 will be wrong
/home/branden/bin/harry-manback: groff_mm.7
troff:./groff_mm.7:1664: error: suppression limit registers span more than a
page; grohtml-info for image 7 will be wrong
pnmcrop: The image is entirely background; there is nothing to crop.
pnmtopng: EOF / read error reading magic number
Calling 'pamcut 190 785 365 219 < /tmp/branden/groff-page-Ai7yQK | pnmcrop
-quiet | pnmtopng -quiet -background rgb:f/f/f -transparent rgb:f/f/f>
groff_mm.7-7.png
' returned status 256
/home/branden/bin/harry-manback: groff_mmse.7
/home/branden/bin/harry-manback: groff_mom.7


("harry-manback" is a script I have that dumps all the man pages in  few
formats to try to flush out issues like this.)

And sure enough, that's a zero length file and it corresponds to something
real.

In this case, the table in the description of the macro `FD` in the
_groff_mm_(7) man page.

The table's just MISSING from the HTML rendering.

So that's bad, and forcing this diagnostic into silence only hides a real
problem.


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