D9692: Improve dialog when PDF wants to open in presentation mode

[Nathaniel Graham]

ngraham edited the test plan for this revision.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D9692

To: ngraham, #okular, aacid, rkflx
Cc: rkflx, michaelweghorn, gassaf, ngraham, aacid