Unexpected line drawn

[GoogleCodeExporter]

1. Draw something
2. Start drawing in the corner/edge of the screen

Instead of drawing from start it continues the last drawing stokes, making a 
'jump' to the new received position

Workaround:
Avoid start a stroke on the corner of the screen.

Possible reason for the bug it's missed touch events (in this case an 
EButton1Down event):
http://discussion.forum.nokia.com/forum/showthread.php?177454-glcanvas-and-touch
-events-missed-EButton1Up-pys60-1.9.7

Possible solution is to filter edge drag touch events to take in consideration 
such behavior.

Original issue reported on code.google.com by [email protected] on 14 Mar 2011 at 11:47