D7249: Return high-resolution line edit clear icon

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  Qt just returns a 16px pixmap by default leading to blurry results when larger icon sizes for small icons are configured by the user.

TEST PLAN
  Originally posted as https://git.reviewboard.kde.org/r/128895
  
  I'm still seeing the issue without this patch.
  
  @hpereiradacosta In Dolphin press Ctrl+F to enter the search, the `KUrlComboBox` in the address bar does *not* exhibit this bug as `KLineEdit` does not use `QLineEdit`'s action feature but its own `KLineEditButton`

REPOSITORY
  R252 Framework Integration

REVISION DETAIL
  https://phabricator.kde.org/D7249

AFFECTED FILES
  src/kstyle/kstyle.cpp

To: broulik, kde-frameworks-devel, hpereiradacosta
Cc: hpereiradacosta, #frameworks
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