minor bug in wxt legen toggle

[<pl...@pi...>]

Hi,

I just noticed that if I select a zoom rectangle in wxt where the final 
virtex happens to land on a legend entry I get the expanded window but 
without the plot line. Rather dis-routing.

It seems that the mouse click that servers to terminate the rect 
selection is also getting processed as a click on the legend and 
triggering the toggle plot line visibility feature.

I expect this is unintentional. It's certainly unexpected.

I would have thought that one mouse click should produce one event , not 
two.

best regards, Peter.