For a million-rows spreadsheet GUI widget that's based on a canvas, and
wants to overlay a single normal widget like a `text-field%` at a time,
over the canvas, for cell value editing... what's the best way to get
that overlay to happen in Racket `gui`?
One idea: in the implementation of `panel%`, looks like I can force it
to be implemented as a canvas (`wx-vertical-canvas-panel%`). If I could
draw the spreadsheet viewport to that same canvas, as well as parent
overlaid widgets to it, I suppose I could use panes to position and size
the editing widget. I don't know whether that would work at all, on all
platforms, and in future Racket releases.
Or is there a better way?
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