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[Alan Bell <alanbell@xxxxxxxxxx>]

as a result of this change, mouse wheel on other launcher icons does
nothing useful at all and mouse wheel on the focussed app icon switches
windows in a different way, it certainly isn't reverse-able like it was,
it is deterministic, but I am struggling to describe the rule, if you
rock one click back and forth on the mouse wheel it flips between one
window and each of the others in turn. Prior to the update it flipped
back and forth between two windows - which preserves the nature of the
mouse wheel, if you use it to flip between windows and go past the
window you wanted, a reverse click now takes you to a different window.

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https://bugs.launchpad.net/bugs/1081843

Title:
  [FFe] Launcher, Window Management - More Effective window switching
  for apps with multiple windows using the Launcher

Status in Ayatana Design:
  Fix Released
Status in Unity:
  Fix Released
Status in “unity” package in Ubuntu:
  Fix Released

Bug description:
  It would be very useful if you could simply hover over an icon of an
  open app and scroll with the mouse wheel to switch and highlight
  between the windows of that app, if it has more.

  ---------------------------------
  Desired resolution:

  Try implementing the following as an experiment.  Before the change
  described below lands in Ubuntu *it must first be user tested, and
  reviewed by the design team*

  If the pointer is positioned over the Launcher icon of an application
  that is in focus which has multiple windows open in the following
  order A,B,C,D,E:

  - Scrolling the mouse wheel 'one click towards the user' should display the next window (B) of the application in the Z stack. e.g.
          Starting Z stack order:   A,B,C,D,E
          Output Z stack order:     B,A,C,D,E

  - Scrolling the mouse wheel 'one click away from the user' should display the bottom window (E) in the application in the Z stack
          Starting Z stack order:   A,B,C,D,E
          Output Z stack order:     E,A,B,C,D

  - Scrolling the mouse wheel 'two clicks towards the user' should first briefly display the next window of the application in the Z stack (window B) after the first mousewheel click, and then on the second mousewheel click return window B to it's previous position in the z-stack and display window C.
          Starting Z stack order:   A,B,C,D,E
          Output Z stack order:     C,A,B,D,E

  - Scrolling the mouse wheel 'two clicks away from the user' should first briefly display the bottom window of the application in the Z stack (window E) after the first mousewheel click, and then on the second mousewheel click return window E to it's previous position in the z-stack and display the next most bottom window, window D.
          Starting Z stack order:   A,B,C,D,E
          Output Z stack order:     D,A,B,C,E

  - Scrolling the mouse wheel 'three clicks towards the user' should first briefly display the next window of the application in the Z stack (window B) after the first mousewheel click, and then return window B to it's previous position in the z-stack and briefly display the next window of the application in the Z stack (window C) after the second mousewheel click, and then on the third mousewheel click return window C to it's previous position in the z-stack and display window D.
          Starting Z stack order:   A,B,C,D,E
          Output Z stack order:     D,A,B,C,E

  - etc, etc... for more windows and more mouse wheel clicks in either
  direction.

  If the application *is not* in focus when the user moves their pointer
  over the Launcher app icon, the first mouse wheel click towards or
  away from the user should focus the application, and bring the top
  most window in the application's z stack to the front of the global z
  stack.  Subsequent clicks of the mouse wheel the operate exactly as
  described above.

  If the application is not running, or has only one open window mouse
  wheel clicking towards or away from the user when the pointer is over
  the application's launcher icon should do nothing.

  Because this behaviour will conflict with the current use of the mouse
  wheel to scroll the launcher, the mouse wheel launcher scroll should
  be changed to only work when the ALT key is held down.  e.g. to scroll
  the launcher with the mouse wheel the user will have to press ALT +
  MOUSEWHEEL UP or press ALT + MOUSEWHEEL DOWN

  
  -------------------------
  Additional test case defining the interaction with minimised windows:

  hyia, minimised windows should be at the back of the stack.  So if App
  1 has have windows A, B, and C (stacking order) and you minimise
  window A, and then focus App 2, when you move your pointer over the
  launcher icon of App 2 and scroll the mousewheel one click, window B
  should appear.  Moving the mouse wheel one more click should then show
  window C.   Moving the mouse wheel one more click should then show
  window A.  Moving the mouse wheel one more click should then show
  window B.  Moving the pointer so that it is no longer over the
  launcher icon of app A at this point should focus window B.  Window A
  should remain minimised.

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