D9221: WIP: [KLineEdit] Use Qt's built-in clear button functionality

[Kai Uwe Broulik]

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

REVISION SUMMARY
  TODO
  
  - Figure out how to get the clear button used size (though from what I can tell it's only used by kcombobox and khtml

REPOSITORY
  R284 KCompletion

REVISION DETAIL
  https://phabricator.kde.org/D9221

AFFECTED FILES
  src/klineedit.cpp
  src/klineedit.h
  src/klineedit_p.h

To: broulik, #frameworks
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