D20182: Compute correct move-resize position on X11

[Vlad Zagorodniy]

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REVISION SUMMARY
  While dimensions of QScreen are in logical pixels, the origin is not.
  As result, computed native coordinates are incorrect (this results in
  jumping cursor and windows).

TEST PLAN
  Drag a window by empty area on a multiple monitor setup (with High DPI).

REPOSITORY
  R31 Breeze

BRANCH
  foo

REVISION DETAIL
  https://phabricator.kde.org/D20182

AFFECTED FILES
  kstyle/breezewindowmanager.cpp

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