using the canvas terminal, the plot is redrawn on every mouseover event without clearing the canvas.
This can be seen best with transparency, e.g. third example on http://gnuplot.sourceforge.net/demo_canvas_4.7/circles.html:
On every mouseover (leave the canvas area with the mouse and enter again), the circles get darker.
The attached patch fixes this.
Maybe this could be improved, so that the plot must not be redrawn every time (or is there a reason for this?)
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