[Bugs] #3618 Paint UNSP: Watch cursor should be shown when invert colors function is called

[Sugar Labs Bugs]

#3618: Watch cursor should be shown when invert colors function is called
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    Reporter:  humitos                    |          Owner:  humitos                    
        Type:  enhancement                |         Status:  accepted                   
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Paint                      |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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Comment(by humitos):

 Maybe this ticket is related with #3559, but I'm not sure because the
 WATCH cursor is working for the Bucket tool, for example.

 The Paint
 [http://git.sugarlabs.org/paint/mainline/blobs/master/Area.py#line1089
 code is doing the things right]: when {{{invert_colors}}} function is
 called this function is executed through {{{gobject.idle_add}}} and in the
 middle {{{self.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.WATCH))}}} is
 called. That method sets the WATCH cursor while the function is being
 performed.

 I can confirm that this is working on Fedora 16 and Debian Testing (sugar-
 jhbuild) with the git version of Paint.

 This doesn't work on:
  * XO 1.75 os12 and os11
  * XO 1.5 os9

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3618#comment:2>
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