D8160: ibe less aggressive when to disable borders

[Marco Martin]

mart created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  if the control height is
  2*Metrics::LineEdit_FrameWidth + option->fontMetrics.height()
  it means that "it just fits", therefore still draw the frame
  
  the qqc2-desktop style uses that logic to get default line edit
  heights, so they all got disabled by just one pixel

TEST PLAN
  tested qwidget and qml apps

REPOSITORY
  R113 Oxygen Theme

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8160

AFFECTED FILES
  kstyle/oxygenstyle.cpp

To: mart
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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