D11064: add preview images to fonts kcm

[Julian Wolff]

progwolff added inline comments.

INLINE COMMENTS

> progwolff wrote in previewrenderengine.cpp:136
> Thanks, this would be much cleaner. Sadly it doesn't seem to work.
> I tried this before. Also tried `setDotsPerMeterX`.
> 
> The image is drawn too big with `QT_SCREEN_SCALE_FACTORS=2`:
> F5743060: Screenshot_20180306_090622.png <https://phabricator.kde.org/F5743060>

It's a bug in Qt: https://bugreports.qt.io/browse/QTBUG-38127

Workaround: set the sourceSize to something.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D11064

To: progwolff, #plasma, harmathy, mart, davidedmundson
Cc: davidedmundson, abetts, broulik, plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, sebas, apol, mart
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