D17929: Hide cursor when tablet stylus leaves proximity of the screen

[Albert Astals Cid]

aacid commandeered this revision.
aacid added a reviewer: sander.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D17929

To: aacid, #okular, sander
Cc: davidhurka, aacid, ngraham, okular-devel, maguirre, fbampaloukas, 
joaonetto, kezik, tfella, darcyshen