D11979: Automatically show and hide selection markers based on single click/double click setting

[Nathaniel Graham]

ngraham created this revision.
ngraham added a reviewer: Dolphin.
ngraham requested review of this revision.

REVISION SUMMARY
  Plasma's Folder View already does this, and it's very logical and humane: with single click, you need the selection markers; with double click, you don't, so determine their presence programmatically. This patch adds the same feature to Dolphin.
  
  FEATURE: 392788
  FIXED-IN: 18.08.0

TEST PLAN
  [video goes here]

REPOSITORY
  R318 Dolphin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11979

AFFECTED FILES
  src/kitemviews/kitemlistcontroller.cpp
  src/kitemviews/kitemlistview.cpp
  src/settings/dolphin_generalsettings.kcfg
  src/settings/general/behaviorsettingspage.cpp
  src/settings/general/behaviorsettingspage.h
  src/views/dolphinitemlistview.cpp
  src/views/dolphinview.cpp

To: ngraham, #dolphin
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