D14222: [KItemListSelectionToggle] Adjust painting icon for high dpi scaling

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Dolphin, davidedmundson, ngraham.
Restricted Application added a project: Dolphin.
Restricted Application added a subscriber: kfm-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Instead of using `KIconLoader` which currently doesn't support high dpi scaling, use `QIcon::fromTheme` which can.

TEST PLAN
  Before
  F6119056: Screenshot_20180719_082717.png <https://phabricator.kde.org/F6119056>
  After
  F6119057: Screenshot_20180719_082927.png <https://phabricator.kde.org/F6119057>
  Verified it still works fine with 1x scaling

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D14222

AFFECTED FILES
  src/kitemviews/private/kitemlistselectiontoggle.cpp

To: broulik, #dolphin, davidedmundson, ngraham
Cc: kfm-devel, spoorun, navarromorales, firef, andrebarros, emmanuelp
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