[okular] [Bug 422626] Allow multiple pages ranges to print in Okular

[Bernie Innocenti]

https://bugs.kde.org/show_bug.cgi?id=422626

--- Comment #10 from Bernie Innocenti <bernie at codewiz.org> ---
(In reply to Bernie Innocenti from comment #9)
> This happens also with a range ("2-3") and also in Kate (so the component
> should be changed to some framework?)

The correct component is probably Qt:
https://invent.kde.org/qt/qt/qtbase/-/blob/dev/src/printsupport/dialogs/qprintdialog_unix.cpp#L820

A similar bug was fixed in Qt long ago:
https://bugreports.qt.io/browse/QTBUG-77351

The commit message of the fix reads:

  Unix: Disable complex page ranges widget when printing to pdf

  It doesn't work since it relies on cups to do the heavy lifting and cups
  is not used when printing to PDF

The code is still present in the Qt 5.15 branch:

  // Disable complex page ranges widget when printing to pdf
  // It doesn't work since it relies on cups to do the heavy lifting and cups
  // is not used when printing to PDF
  options.pagesRadioButton->setEnabled(outputFormat != QPrinter::PdfFormat);

Yet, the radio button remains enabled for me. So perhaps it's not working as
intended.

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