[Bugs] #4897 Sugar NORM: menu pops up in wrong place sometimes

[Sugar Labs Bugs]

#4897: menu pops up in wrong place sometimes
--------------------------+--------------------------
       Reporter:  quozl   |       Owner:
           Type:  defect  |      Status:  new
       Priority:  Normal  |   Milestone:  Unspecified
      Component:  Sugar   |     Version:  Unspecified
       Severity:  Minor   |    Keywords:
Distribution/OS:  OLPC    |  Bug Status:  New
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 sometimes a menu will appear in the wrong place on screen.  this seems to
 happen especially when the system is under load.

 however, it can be reproduced carefully on a system with no load by
 forging mouse actions with strict timing.

 sugar should behave correctly even in this scenario, and fixing it to work
 correctly will also fix the problems when under load.

 restating in standard bug report format:

 problem: menu pops up in wrong place sometimes

 reproducer: right click on the centre icon, then between 10 and 40
 milliseconds later move the mouse a long way from the icon.

 expected result: menu should be drawn where the click was captured.

 observed result: menu is drawn in the new mouse location.

 occurs reliably with times of up to 100 milliseconds, then becomes less
 reliable.

 automated method of reproducing;

 prepare the system:
 {{{
 sudo yum install xdotool
 service sshd start
 chkconfig sshd on
 passwd #   or other method to enable remote SSH into system
 }}}

 position sugar at the home view with no menu popped up.
 reproduce the problem:

 {{{
 ssh host 'DISPLAY=:0 xdotool mousemove 600 450 click 3 sleep 0.04
 mousemove 30 30'
 }}}

 observe the location of the menu.

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Ticket URL: <https://bugs.sugarlabs.org/ticket/4897>
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