D26185: Fix font rendering when compiled against Qt >= 5.14

[Andreas Hartmetz]

ahartmetz created this revision.
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REVISION SUMMARY
  Whatever behavior change was apparently expected in Qt 5.14 didn't happen. I compiled against Qt 5.14 and got rather bad looking fonts. Tested on a 14" full HD screen which is almost HiDPI (Windows scales 1.25x or 1.50x or so unless configured otherwise).

TEST PLAN
  Compiled and ran the whole KDE / Plasma stack and looked at font rendering in konsole (most extreme difference), also tested changing only the environment variable. It is clear that the environment variable makes the difference.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D26185

AFFECTED FILES
  startkde/startplasma.cpp

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