D18358: Add buttons to collapse and expand all elements

[Albert Astals Cid]

aacid accepted this revision.

REPOSITORY
  R223 Okular

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

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