D28725: Drop QWindow and explicit devicePixelRatio usage for ComboBox

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, davidre, hpereiradacosta.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  It's not done anywhere and breaks rendering the `ComboBox` on high dpi.

TEST PLAN
  Would still like to know why this originally passed the window to it
  
  Before
  F8230330: Screenshot_20200410_174928.png <https://phabricator.kde.org/F8230330>
  After
  F8230332: Screenshot_20200410_180405.png <https://phabricator.kde.org/F8230332>

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D28725

AFFECTED FILES
  kstyle/breezestyle.cpp

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