D10031: Fix potential crash

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: Kirigami, mart.
Restricted Application added projects: Plasma, Kirigami.
Restricted Application added a subscriber: plasma-devel.
apol requested review of this revision.

REVISION SUMMARY
  Turns out in some weird (wrong) cases, ListView sets a negative maximum()
  value. This makes the application crash in qcommonstyle.cpp.
  This prevents the crash by making sure opt->maximum is never smaller than
  opt->minimum.

TEST PLAN
  Manual test, now Discover doesn't crash

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10031

AFFECTED FILES
  plugin/kquickstyleitem.cpp

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