[Octave-patch-tracker] [patch #9280] Add data cursor functionality in plots

[Philip Nienhuis]

Follow-up Comment #12, patch #9280 (project octave):

I think linking it to axes is probably not a good idea - think of patches,
what does the cursor need to point to? interpolate in 2D? (or 3D?)
Would linking through  __plt__.m  not catch most "line" and "point"
occurrences?

A datacursor for 3D is challenging - any position along a line perpendicular
to the projection on the canvas is a valid coordinate point, what should
datacursor return in case of stacked surfaces or solid 3D objects? But maybe
there is a clever way to do it. If it operates on 3D polylines or "wrinkled'
3D polygons it could work.

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