[Bugs] #4911 Sugar NORM: background control panel continues loading images after apply or undo

[Sugar Labs Bugs]

#4911: background control panel continues loading images after apply or undo
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       Reporter:  quozl        |       Owner:
           Type:  defect       |      Status:  new
       Priority:  Normal       |   Milestone:  Unspecified
      Component:  Sugar        |     Version:  Git as of bugdate
       Severity:  Minor        |    Keywords:
Distribution/OS:  Unspecified  |  Bug Status:  New
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 Reproducer: place a logging statement temporarily in the finishing code
 path of the idle method _append_to_store, open the background control
 panel, then close it before the images have been loaded.

 The logging statement (and system load) shows that the idle is not removed
 by apply or undo, and continues to execute.

 Sugar 0.107.0

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Ticket URL: <https://bugs.sugarlabs.org/ticket/4911>
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