Preview musings (and a question about pnmcrop)

[José Matos]

Hi,
  my main focus now is to try to clean the python scripts that we use.

Musing:
I need to look immediately into the preview stuff since I found that in
python 3.13 the pipe module is gone (it is a small wrap around
os.popen).

The only place where we use it to call consecutively pnmcrop with
options -left, the first time, and -right the last time.

As far as I can see this is not required at all, pnmcrop supports both
options at once. So I will fix this issue this way.

Question:
Does anyone have a reason to keep the current two stages process?

Best regards,
-- 
José Abílio