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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: horizon
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1359245

Title:
  Middleware creates tuple on every iteration of a loop

Status in OpenStack Dashboard (Horizon):
  Fix Released

Bug description:
  In this generator [1] (nested in a for-loop) the middleware constantly
  recreates the same tuple. This would perform better if two changes
  were made:

  1. Use a set instead of a tuple
  2. Assign the set once outside of the for-loop saving several object creations. 

  [1]:
  https://github.com/openstack/horizon/blob/0f3192f84c872b1060ac6b7bbe1a3b34bbaf1b36/horizon/middleware.py#L179..L180

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