[Bugs] #4958 Sugar NORM: metacity is not reaped, failure is not detected

[Sugar Labs Bugs]

#4958: metacity is not reaped, failure is not detected
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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:          |  Bug Status:  New
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 Sugar starts the Metacity window manager in src/jarabe/main.py

 If Metacity fails, the process remains in Z (defunct) state, it is not
 reaped by jarabe calling wait(2), and several display behaviours occur;

 * alt+tab and shift+alt+tab don't work,
 * frame works, but selecting alternate views doesn't work.

 The learner must restart the computer using power button.

 Perhaps Sugar should restart Metacity if it fails.

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Ticket URL: <https://bugs.sugarlabs.org/ticket/4958>
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