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

[Nathaniel Graham]

ngraham added a comment.


  Also please remove the `[WIP]` from the title since there's nothing here that's really WIP as far as I can tell; just a string change and waiting for icons.

REPOSITORY
  R223 Okular

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

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