Both Unity8 and QtMir are excused. On the day of the regression, unity8
was unchanged and qtmir changed but not in logic.

This leaves only Mir. On the day of the regression Mir was upgraded from
0.19.3 to 0.20.0. And looking at the source code, a large amount of code
changed in Mir's buffering/GL logic between those releases.

** Changed in: qtmir
       Status: Confirmed => Invalid

** Changed in: qtmir (Ubuntu)
       Status: Confirmed => Invalid

** Changed in: mir
    Milestone: None => 0.22.0

** Also affects: mir/0.21
   Importance: Undecided
       Status: New

** Also affects: mir/0.20
   Importance: Undecided
       Status: New

** Changed in: mir/0.21
   Importance: Undecided => High

** Changed in: mir/0.21
       Status: New => Confirmed

** Changed in: mir/0.20
       Status: New => Won't Fix

** Changed in: mir/0.20
       Status: Won't Fix => Confirmed

** Changed in: mir/0.20
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1563287

Title:
  [regression] [OTA-10] Spread animation stutters badly with only a few
  apps opened

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