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[Robert Ancell <robert.ancell@xxxxxxxxxxxxx>]

** No longer affects: xmir

** Tags added: xmir

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https://bugs.launchpad.net/bugs/1220629

Title:
  xmir_screen_for_each_damaged_window iterates through all outputs on
  every frame (including unused ones)

Status in xorg-server package in Ubuntu:
  New

Bug description:
  xmir_screen_for_each_damaged_window iterates through all outputs
  (including unused ones), on every frame.

  I thought it was a bit odd when debugging
  xmir_screen_for_each_damaged_window that it iterated through 6-8
  different xmir_window's. I only have two outputs plugged in. The
  number actually grew over time (with display config changes?).

  I think we should avoid iterating (or even creating) unused
  xmir_windows. In the very least it's inefficient to process all the
  damage reports more times than necessary.

  Furthermore, I suspect the unused xmir_windows are accumulating damage
  that never gets emptied, which is probably bad.

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