D18358: Add buttons to collapse and expand all elements

[Joao Oliveira]

joaonetto added a comment.


  Just added some screenshots with the results.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D18358

To: joaonetto, #okular, #vdg, ngraham
Cc: ndavis, aacid, ngraham, okular-devel, tfella, darcyshen
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