D21037: Add deselect action

[Farid Boudedja]

faridb created this revision.
Herald added a project: Dolphin.
Herald added a subscriber: kfm-devel.
faridb requested review of this revision.

REVISION SUMMARY
  Add the ability to deselect selected elements.
  This uses `KStandardAction::deselect` which is by default assigned to [control] + [⇧] + [a].
  
  FEATURE: 184717

REPOSITORY
  R318 Dolphin

BRANCH
  feature/deselect

REVISION DETAIL
  https://phabricator.kde.org/D21037

AFFECTED FILES
  src/dolphinmainwindow.cpp
  src/dolphinmainwindow.h
  src/dolphinui.rc

To: faridb
Cc: kfm-devel, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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