D20445: signalplotter: Add highdpi support

[Alexander Volkov]

volkov added inline comments.

INLINE COMMENTS

> zzag wrote in ksignalplotter.cpp:897-899
> Could you please explain why we have to do this?

To avoid artifacts when painting beams.

REPOSITORY
  R111 KSysguard Library

REVISION DETAIL
  https://phabricator.kde.org/D20445

To: volkov
Cc: zzag, plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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