D20004: Add "Up" action to editable mode, accessible via Key_Up press while focus is on lineEdit

[Nathaniel Graham]

ngraham added a reviewer: VDG.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D20004

To: krutovmikhail, #dolphin, #vdg
Cc: kfm-devel, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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