D25006: Make sure -dpi value is valid

[Filip Fila]

filipf added a comment.


  David's suggestion to just turn `dpiValue` into an int sounds sensible to me. @gcraciunescu do you want to finish this patch?

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

REVISION DETAIL
  https://phabricator.kde.org/D25006

To: gcraciunescu, filipf, #plasma, ngraham, davidedmundson
Cc: davidedmundson, ngraham, plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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