D18358: [WIP] Add buttons to collapse and expand all elements

[Nathaniel Graham]

ngraham added a reviewer: Okular.
ngraham added a comment.


  If you need icons, please file a bug in the `Breeze | Icons` product and add #VDG <https://phabricator.kde.org/tag/vdg/> as a subscriber to the patch.

REPOSITORY
  R223 Okular

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

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