[Differential] [Request, 6 lines] D3263: fix behavior of scrollable systray popups

[mart (Marco Martin)]

mart created this revision.
mart added a reviewer: Plasma.
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REVISION SUMMARY
  it's very rare that the icon list in the hidden area
  of the systray is long enough to get a scrollbar, but
  when it does it had a couple of issues:
  sometimes it gets an horizontal scrollbar too and
  the wheel events gets eaten:
  always disable the horizontal scrollbar and
  ignore wheel events over the label.
  wheel events over the icon are still managed by
  the applet (so still possible to for instance
  adjusting the volume on pa applet)
  
  BUG:372050

TEST PLAN
  hidden all the cions to enable scrollbar: wheel over
  the text scrolls the view, over the icon adjusts the volume

REPOSITORY
  rPLASMAWORKSPACE Plasma Workspace

BRANCH
  phab/wheel

REVISION DETAIL
  https://phabricator.kde.org/D3263

AFFECTED FILES
  applets/systemtray/package/contents/ui/HiddenItemsView.qml
  applets/systemtray/package/contents/ui/items/AbstractItem.qml

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: mart, #plasma
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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