Update of bug #65961 (group groff):
Summary: pre-html.cpp: suppress spurious warnings from buggy
pnmcrop => [grohtml] pre-html.cpp: suppress certain warnings from pnmcrop
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Follow-up Comment #2:
Not sure I agree with you this time, Dave.
_pre-grohtml_(1) does sometimes seem to cause blank images to be constructed.
That in turn seems to be harmless behavior (while I'm not a fan of the clutter
on the file system, _grohtml_'s design commits it to a footprint there), and
if it's a bug, then it looks to me like it's a bug in _pre-grohtml_ for
passing empty rectangular regions of the page image to _pnmcrop_ in the first
place. That hypothesis needs to be checked, but if it's correct then
_pnmcrop_ is doing what we ask of it, and throwing a diagnostic when it
_can't_ do what we're asking of it (crop an uncroppable image).
See its [https://netpbm.sourceforge.net/doc/pnmcrop.html upstream
documentation].
I do concede that if we can and do fix _pre-grohtml_ to never send blank
rectangles to _pnmcrop_ in the first place, we can (and should_ reënable this
diagnostic.
But since my (long-term) plan is to stop producing images from _tbl_ and _eqn_
regions in the first place (see bug #60052 et al.), I don't feel strongly
motivated to tackle the blank rectangle issue.
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