D7962: Implement several new print scaling options

[Oliver Sander]

sander marked 4 inline comments as done.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D7962

To: sander, #okular, aacid
Cc: okular-devel, cfeck, rkflx, michaelweghorn, ngraham, aacid