[Bug 1342731] Re: Horizontal Scrolling over Indicator-ng (and sound) does not work as expected

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** Tags added: patch

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https://bugs.launchpad.net/bugs/1342731

Title:
  Horizontal Scrolling over Indicator-ng (and sound) does not work as
  expected

Status in Libindicator:
  In Progress
Status in Nux:
  Fix Committed
Status in Nux trusty series:
  In Progress
Status in Unity:
  Fix Committed
Status in Unity 7.2 series:
  In Progress
Status in “libindicator” package in Ubuntu:
  In Progress
Status in “nux” package in Ubuntu:
  In Progress
Status in “unity” package in Ubuntu:
  Fix Released
Status in “libindicator” source package in Trusty:
  New
Status in “nux” source package in Trusty:
  New
Status in “unity” source package in Trusty:
  New

Bug description:
  [Impact]
  When scrolling on indicator-sound using the horizontal scrolling the result is the opposite to what we expect in unity (left scrolling increases the volume and right scrolling decreases it), while in general is not handled at all for indicator-ng indicators as both left and right scrolling always ends up in a "+1" delta scroll.

  [Test case]
  1. Hover Indicator-sound in unity
  2. Scroll left: the volume should be reduced
  3. Scroll right: the volume should be increased

  [Regression potential]
  The horizontal scroll direction might be inverted with some touchpads

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