#12681 NORM 13.2.0: cairo can't draw rectangle with transparency on xo-4 or xo-1.75

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#12681: cairo can't draw rectangle with transparency on xo-4 or xo-1.75
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 Reporter:  godiard          |                 Owner:  dsd          
     Type:  defect           |                Status:  new          
 Priority:  normal           |             Milestone:  13.2.0       
Component:  x window system  |               Version:  not specified
 Keywords:                   |           Next_action:  diagnose     
 Verified:  0                |   Deployment_affected:               
Blockedby:                   |              Blocking:               
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 TestCase:

 * Start Paint.

 * Select the in the toolbar Shapes, the Rectangle tool.

 * Draw a few rectangles

 * In the colors palette, change the Opacity, to something different than
 100%.

 * Try draw more rectangles.

 Result:

 * No rectangle is drawn. All the other shapes works ok.

 If test the same on xo-1 or xo-1.5, works, the problem is only with
 xo-1.75 and xo-4

 Attached is a simpler testcase too, alpha.py: Should draw two rectangles
 and one circle.

 Looks like some fast path is not working.

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Ticket URL: <http://dev.laptop.org/ticket/12681>
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