[Bugs] #4253 sugar HIGH: Palette trackpad interaction: they don't close after clicking items

[Sugar Labs Bugs]

#4253: Palette trackpad interaction: they don't close after clicking items
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    Reporter:  greenfeld    |          Owner:  manuq         
        Type:  defect       |         Status:  assigned      
    Priority:  High         |      Milestone:  0.98          
   Component:  sugar        |        Version:  0.97.x        
    Severity:  Unspecified  |       Keywords:  regression, r?
Distribution:  OLPC         |   Status_field:  Unconfirmed   
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Comment(by manuq):

 Trying a more general solution: we could connect a callback for the item
 'activate' signal in the palette, and call popdown from it.  Unfortunatly
 this needs some API change, so I think we are safer calling the popdown
 explicitly (first patch).

 Anyways, leaving a note here of what I've tried.

 My first attempt: Palette.set_content() is always receiving a widget that
 is a Gtk.Container, like Gtk.VBox.  So first I tried to connect the
 palette to the 'add' signal [1], so that each time an item is added, we
 connect its 'activate' signal to the palette.  But turns out the callback
 is not called for pack_start/pack_end, only for add.  So, there isn't a
 signal we can listen for when a widget is packed.  Testcase: [2].

 [1] http://developer.gnome.org/gtk3/stable/GtkContainer.html#GtkContainer-
 add
 [2] http://dev.laptop.org/~manuq/shell-port/test_add.py

 So I did a fix only for when the palette content is a PaletteMenuBox, and
 the PaletteMenuItems are added to it using the append_item() method.  This
 requires API change.  The two patches above shows this work for the Buddy
 palette.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4253#comment:12>
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