[Octave-patch-tracker] [patch #9280] Data cursor for Octave 4.0.x and 4.2.x

[Philip Nienhuis]

Follow-up Comment #6, patch #9280 (project octave):

Before turning it into a cset it seems some more work needs to be done.

Essentially the patch boils down to:
* adding  __datacursor_menu__.m and __datacursor__.m into 
scripts/plot/draw/private/
* adding a call to  __datacursor_menu__  in the end of
scripts/plot/draw/private/__plt__.m and apparently __stem__.m 
but maybe it needs to be called in other basic plotting functions as well;
that has to be sorted out.

If the plot window is closed, do the listeners installed by the new functions
have to be deleted explicitly?

It has to be sorted out why, after requesting the cursor XY data, hitting the
Enter key is needed to get the variable into scope.

The prefix for Windows paths is made in mxe-octave no need to explicitly add
it.

A personal not: compared to Panxto's original .m files
(https://octave.1599824.n4.nabble.com/Data-cursor-in-Octave-tp4681801p4681843.html)
this v3 patch has just black annotations in quite a big font (Panxto's had
another color for each new annotation and in smaller font, both of which I
liked better)


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