D9328: Add support for cancellable image rendering and text extraction

[Kevin Ottens]

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

REPOSITORY
  R223 Okular

BRANCH
  cancellable (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D9328

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