[Bugs] #4717 Sugar UNSP: Error trying to open object palette in the journal

[Sugar Labs Bugs]

#4717: Error trying to open object palette in the journal
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  Reporter:  godiard                    |            Owner:
      Type:  defect                     |           Status:  new
  Priority:  Unspecified by Maintainer  |        Milestone:  Unspecified
 Component:  Sugar                      |          Version:  Unspecified
  Severity:  Unspecified                |       Resolution:
  Keywords:                             |  Distribution/OS:  Unspecified
Bug Status:  Unconfirmed                |
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Comment (by godiard):

 Looking at the code, I have found a possible source of this problem.

 palette_invoker is a CellRendererInvoker. This invoker have a method
 __motion_notify_event_cb attached to the treeview,
 then when the mouse is moved outside of the cell, the palette can be hide.
 In that case, set the path to None.
 Then if you move the mouse, and after that, do a long touch over a cell,
 the path is None and trigger this issue.
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4717#comment:1>
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