D20445: signalplotter: Add highdpi support

[Alexander Volkov]

volkov added a comment.


  Beams look ugly when their width is >= 4 pixels.
  The idea is to draw them with the same width regardless of DPI.
  Another option is to not set Qt::FlatCap for thick pens, but I prefer this one.

REPOSITORY
  R111 KSysguard Library

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

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