This patch fixes the issue as reported.  There's a lot of little weird
behaviours that plotdf still has and hopefully this doesn't introduce
anything more, but as far as my problems are concerned it solves them.
The graph is a little skewed when you move it - but no more skewed than
you'd normally get and the skew is a graph-preserving/affine(?)
transformation.

Whereas before this patch, what would happen is you would eventually
lose your graph entirely* by resizing, effectively limiting the size a
graph could be even on a fairly high resolution monitor (since to get to
the interesting bits would involve resizing and zooming, this allows you
to zoom in and zoom out, but resizing your window would normally lose
you your graph in short order)

It still behaves a little weird in some cases - fullscreening the window
& making the window size 0 can still skew the graph but the good news is
that no matter what you do with it, by hitting refresh you get your
graph back, right where you can see it. Whereas before you'd get your
graph back, maybe, somewhere far off the screen where it isn't useful*.

(*I learned while finding this that if you click right mouse button and drag 
you can also 
move the graph, which is overly sensitive to mouse movements but that's another 
story)

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https://bugs.launchpad.net/bugs/1670197

Title:
  plotdf window picture slowly moves to the right when resizing window

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