D8704: Don't use exec() to open dialogs

[Albert Astals Cid]

aacid accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R223 Okular

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8704

To: elvisangelaccio, #okular, aacid
Cc: ngraham, okular-devel, aacid
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