Unwanted line toggle on mouse click events

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

Hi,

I have noticed a small  defect in toggling line visibility from the 
keybox: it can interfere with other mouse functionality.

It seems that any mouse click event : left , right or middle will toggle 
visibility if it happens on a active part of the legend. This result in 
two things in the case fo right-mouse and 3rd-button / scroll-wheel 
click events.

3rd button will stamp mouse coords on top of the legend at the same time 
as greying the legend and toggling the line. I doubt that either result 
is that useful.

A right click as the first point in selecting a new zoom for the plot 
also triggers the line toggle. I think in this case it is fair to assume 
that user did not intend to do both and the result is undesirable.


The obvious fix would seem to be only triggering the line toggle on 
left-button clicks.

This defect was seen on qt-terminal on 5.0.1. I have not tested other 
terminals.

Is this the way it is intended to work , an oversight or a possible bug 
on this terminal ?

Best regards. Peter.