[Bugs] #4307 sugar URGE: clipboard.set_with_data/set_with_owner is not introspectable

[Sugar Labs Bugs]

#4307: clipboard.set_with_data/set_with_owner is not introspectable
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    Reporter:  godiard      |          Owner:  erikos     
        Type:  defect       |         Status:  new        
    Priority:  Urgent       |      Milestone:  0.98       
   Component:  sugar        |        Version:  Unspecified
    Severity:  Unspecified  |       Keywords:  regression 
Distribution:  Unspecified  |   Status_field:  Unconfirmed
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Comment(by erikos):

 Thanks for the patch Manuel, we have three issues actually left:

 - when adding the first item to the clipboard the Palette is shown

 - when adding the second item the UI turns unusable

 - there is an assertion error when we do set_content for the ClipboardMenu

 The latter is because we do use a ClipboardMenu which is of type GtkMenu
 and try to use set_content which is only available for our custom Palettes
 (we can not mix a GTKMenu with other widgets). Since our custom Palette
 does not support submenus which the ClipboardMenu has we can not switch to
 our custom Palette neither. Maybe it is ok to remove the progress show
 support for now. It won't be needed for small clippings anyhow which are
 99% of the cases I bet.

 For the other two cases I have no good explanation yet, will investigate
 more.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4307#comment:14>
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