[Bug 1890013] Re: ocrfeeder PDF import systematically fails

[Dirk F]

For historical interest, I note that I don't see (2) in ocrfeeder 0.8.1
under Xenial. Fixing (1) by reverting gs to 9.25 or replacing with a
patched 9.50 solved my issue with ocrfeeder in that configuration. I
presume it's running under Python 2.7.17.

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Title:
  ocrfeeder PDF import systematically fails

Status in ocrfeeder package in Ubuntu:
  Confirmed

Bug description:
  [Impact]
   When attempting to import PDF files, a scenario frequently
   occurs in which the import fails with no error message.
   This happens because ocrfeeder does not wait for the call
   to ghostscript to finish running before attempting to
   read its output.

  [Test Plan]
   * Run ocrfeeder
   * Click File -> Import PDF
   * Choose a PDF file with many pages, as this will
     be more likely to trigger the bug
   * Observe that none of the PDF pages appear in ocrfeeder
     and it states "No images added" in the lower left corner
   * Install ocrfeeder from -proposed
   * Attempt to import the PDF file again, and observe that
     all of the pages appear in ocrfeeder

  [Regression Potential]
   If the ghostscript call hangs indefinitely for any
   reason, the ocrfeeder application will also be hung.

  [Original Description]
  Using the File menu of ocrfeeder :

  -  Adding a JPG image systematically succeeds,

  -  Importing a PDF systematically fails (without any error message).

  Please fix the handling of PDF by ocrfeeder.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ocrfeeder 0.8.1+git20200128.b945089-1
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: X-Cinnamon
  Date: Sun Aug  2 01:09:44 2020
  ExecutablePath: /usr/bin/ocrfeeder
  InstallationDate: Installed on 2019-08-26 (340 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  InterpreterPath: /usr/bin/python3.8
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
  SourcePackage: ocrfeeder
  UpgradeStatus: Upgraded to focal on 2020-06-23 (39 days ago)

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