Display error in Realtime_Plot example

[Cypher <the...@gm...>]

Hi Uwe,
I experiemced a bug in the Realtime_Plot example in Qwt5rc1:

If you start it, then zoom in, zoom out again and then start the point
drawing, I get 2 thin red bars at the bottom and the right of the plot
( very few times the bar at the bottom was ~10 times the height as in
the screenshot. And sometimes the whole plot flickers red for a split
of a second)

I took a screenie -> http://img397.imageshack.us/img397/1925/realtimeqy4.jpg

Setup: Qt4.2.2 commercial debug-release, Qwtrc1 release, VS2k5 Pro

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In the Event Filter example, when grabbing a point of the line and
moving it around the whole plot "shakes" and flickers a bit.


Greetings Phil Schuler