D23868: [kfontinst] Port to use icons from the icon theme and make HiDPI aware

[Yunhe Guo]

guoyunhe added a comment.


  I changed it to QToolButton, but it still look different:
  
  F7352361: image.png <https://phabricator.kde.org/F7352361>

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D23868

To: guoyunhe, #plasma, ngraham
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