[Octave-bug-tracker] [bug #34120] using mouse-scrolling after plotyy losed y1 plot

[anonymous]

Follow-up Comment #3, bug #34120 (project octave):

When I said "gnuplot does not do this" I was referring to the buggy behaviour
just described in the previous sentence.

To be explicit: octave calling gnuplot exhibits the described problem. Using
gnuplot directly on the same system does not lose lines when scrolling in
either single or double axes plotting. 

 x=[0:10];y=x;
 plotyy(x,y,x,-y)

then scroll with arrow key or mouse wheel. First mouse/key scroll event and
the first plot line vanishes, as described.

On looking more closely at this, I notice this is more of the "last axis used"
paradigm bugginess. 

It seems the scrolling and redraw is only communicated to the y2 axis and
plot. Not only does the x1,y1 plot disappear, so do those axes! 

"An" x axis remains but this is probably the undocumented and identical x2
axis, I'd bet money the x1 has gone as well. 

This only emphasises my existing criticisms of plotyy and the last axis
syndrome.

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