D18744: [WIP]Select entire page with double click

[Shubham]

shubham added a reviewer: ngraham.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D18744

To: shubham, aacid, ngraham
Cc: okular-devel, tfella, ngraham, darcyshen, aacid