D9792: even slimmer scrollbars

[Marco Martin]

mart created this revision.
mart added reviewers: Plasma, Kirigami, VDG.
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REVISION SUMMARY
  the scrollbar handle will be very slim normally, and grow a bit on mouse
  over, this makes it work better with QtQuickControls2 listviews where
  the contents overlap the scrollbar (as other platform are going in
  this direction since they all have scrollbars visible only on scroll
  or mouse over)
  this makes scrollbars appear more light but still always visible to
  convey information

TEST PLAN
  works both as qwidget and with the qstyle-based qqc2-desktop-style

REPOSITORY
  R31 Breeze

BRANCH
  phab/slimScrollbars

REVISION DETAIL
  https://phabricator.kde.org/D9792

AFFECTED FILES
  kstyle/breezestyle.cpp

To: mart, #plasma, #kirigami, #vdg
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, davidedmundson, mart, hein
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