D21153: [Notifications KCM] Hack scroll bar not crashing

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
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REVISION SUMMARY
  For some reason since the `WheelHandler` rewrite the `position` of the horizontal scroll bar is `NaN` leading to all sorts of odd behavior and now even crashes.
  
  BUG: 407446

TEST PLAN
  It's been broken for weeks with nobody caring but only started crashing with f7f99e8b8ca42c1036db4c25ce0488df2046b6a9 <https://phabricator.kde.org/R858:f7f99e8b8ca42c1036db4c25ce0488df2046b6a9> where an `SIGFPE` is raised in `QCommonStyle` as a result of this.
  
  - Opened KCM, opened configure page, now no longer crashes.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D21153

AFFECTED FILES
  kcms/notifications/package/contents/ui/SourcesPage.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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