Expected behavior

I'd expect the ShowTracker function in OxyPlot.WindowsForms/PlotView.cs to offset the trackerLabel location if it is too close to the edge of the PlotView control containing it. For example if the left most 30 pixels of the label would be outside the PlotView control and not visible, I'd expect the label to be offset 30 pixels to the right to compensate. Vertically things get a little trickier due to potential overlap with the mouse cursor, but some cursor overlap is the lesser of two evils.

Actual behavior

If the mouse is clicked/dragged to close to a PlotView control boundary the tracker label is clipped.