[Octave-bug-tracker] [bug #37554] PaperPositionMode = 'auto' is ignored for printing

[Ben Abbott]

Follow-up Comment #8, bug #37554 (project octave):

I just occurred to me that ML is likely using listeners to handle this.  So I
did a test to confirm.


>> close all
>> plot (rand (3))
>> get (gcf, 'paperposition')

ans =

    0.2500    2.5000    8.0000    6.0000

>> set (gcf, 'paperpositionmode', 'auto')
>> get (gcf, 'paperposition')

ans =

    1.1333    3.1667    6.2222    4.6667

>> set (gcf, 'paperpositionmode', 'manual')
>> get (gcf, 'paperposition')

ans =

    1.1333    3.1667    6.2222    4.6667


This means my proposed patches are the wrong approach.  Instead graphics.cc
and graphics.h.in will need to be modified to properly handle the
paperpositionmode and related properties.

Specifically we need the following updaters.

(1) If "position", "paperorientation", or "papersize" are modified and
"paperpositionmode" == "auto" update "paperposition" so that the image is
centered on the page.
(2) If "paperposition" is modified set "paperpositionmode" to "manual".

Anything else?

If those updaters are added, I think the current implementation for print.m
will function correctly.

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