Hello,

I'm using Qwt 6 SVN trunk and I'm seeing a behavior in Qwt I'd like to avoid.
Here is what I mean:
1. Open "bode" example.
2. Switch to Zoom mode and pan the plot so that the 0.01 vertical line (where the curves start) is in the middle of the screen.
3. Zoom in on the middle of the screen so that the start point of the yellow curve is in the middle of the zoom rectangle.

The behavior I see is that the 0.01 vertical line, instead of remaining in the middle (since I zoomed around it) is actually at the left border of the canvas, and so are the curve start points.

The same thing happens with the curve end points - each time I zoom in, they are always at the right border or past it.

Is there a way to avoid this behavior, so that the zoom-rectangle middle point actually stays in the middle?

Thanks in advance!