D12468: Enable anti-aliasing for user avatars

[Kirill Tatunov]

ktatunov created this revision.
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REVISION SUMMARY
  By default, QT uses fast transformations when scaling pixmaps but it results in a very pixelated image. This patch fixes it for avatars in the user manager module.

TEST PLAN
  Resolution of the original avatar image is 256x256.
  Before: F5819211: user-manager-before.png <https://phabricator.kde.org/F5819211>
  After: F5819213: user-manager-after.png <https://phabricator.kde.org/F5819213>

REPOSITORY
  R128 User Manager

REVISION DETAIL
  https://phabricator.kde.org/D12468

AFFECTED FILES
  src/lib/accountmodel.cpp

To: ktatunov, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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