#8040 NORM 8.2.0 (: Garbage screen interference artefacts when previewing Trac tickets on XO.

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#8040: Garbage screen interference artefacts when previewing Trac tickets on XO.
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 Reporter:  thomaswamm    |         Owner:                                   
     Type:  defect        |        Status:  new                              
 Priority:  normal        |     Milestone:  8.2.0 (was Update.2)             
Component:  not assigned  |       Version:  Development build as of this date
 Keywords:                |   Next_action:  reproduce                        
 Verified:  0             |     Blockedby:                                   
 Blocking:                |  
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 When I update Trac tickets then do Preview, I sometimes see garbage in the
 resulting Preview box, mixed in with what I expect to see.  Looks like
 colored snow, or diagonal TV interference, or corrupted display memory.
 See Screenshots.  It is a static unchanging image, until I do input.
 Sometimes just hitting Alt-1 (for Screenshot) will change the interference
 pattern slightly, or fix it.

 Probably this is happening inside my XO (Browse-95 and joyride-2301), but
 maybe it comes from the Trac server?  If so, it should show on a non-XO
 computer.

 I have noticed this problem on a significant fraction of my Trac Previews.
 And only when I do Preview. Rarely, the interference extends outside the
 Preview box.  When I scroll the screen, the interference scrolls in sync
 with everything else, off the screen and then back onto the screen if I
 reverse scroll.

 I suggest that other people please Preview their Trac ticket updates on
 their XO's using Browse-95 in joyride-2301.

 I have not previously participated in Trac using earlier XO software, so
 don't know if this bug is new or old.

 Idea:  perhaps this bug is related to the "DRAFT" background watermark
 seen in the Preview text box?

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Ticket URL: <http://dev.laptop.org/ticket/8040>
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