D20155: [SpinBox] Improve mouse wheel behavior

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  Emit `valueChanged` signal since this is an explicit user interaction.
  Also, enforce "steps" for high precision touchpad scrolling.

TEST PLAN
  - Scrolling with touchpad no longer makes it go crazy
  - Changing value with wheel has the same effect now as clicking the arrow buttons

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

REVISION DETAIL
  https://phabricator.kde.org/D20155

AFFECTED FILES
  org.kde.desktop/SpinBox.qml

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