D25685: [QImageItem/QPixmapItem] Don't lose precision during calculation

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Operate on `QRectF`/`QSizeF` and only round back to integer at the end.

TEST PLAN
  I've always been under the impression that the previews in icons kcm were misaligned or cut off slightly.
  Before
  F7796401: Screenshot_20191202_155753.png <https://phabricator.kde.org/F7796401>
  After
  F7796402: Screenshot_20191202_155733.png <https://phabricator.kde.org/F7796402>
  
  - Notification thumbnail strip (qpixmapitem) still works
  - QR code in klipper (qimageitem) still works

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D25685

AFFECTED FILES
  src/qmlcontrols/kquickcontrolsaddons/qimageitem.cpp
  src/qmlcontrols/kquickcontrolsaddons/qpixmapitem.cpp

To: broulik, #plasma
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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