[Octave-bug-tracker] [bug #50466] makehgtform function missing

[Gary E. Deschaines]

Follow-up Comment #25, bug #50466 (project octave):

Rik,

Well, "this is a fine mess we've gotten into."

The simple_2d_hgt_test.m script from comment #16 works in Octave 4.2.2 with
hgtransform.m, but here is an error I encountered using my locally built
Octave 4.4.1 executable. 

++
error: invalid value for array property "xlim"
error: called from
    simple_2d_hgt_test at line 11 column 1
--

As with the hgtransform 'parent' property/value pair passed in line(), plot()
and plot3() function calls, the problem occurs when the hgtransform
children_cb() is executed.

I compiled a debug version of Octave 4.4.1, executed 'octave --no-gui
simple_2d_hgt_test.m', and to my surprise the above error occurred.

The error does not occur for the following two test script changes.

++
Change 1:
    #axis([-2 2 -2 2]);
    x = line([0;1], [0;0], 'color', 'r');
Change 2:
    axis([-2 2 -2 2]);
    x = line('color', 'r');
--

Is it possible the hgtransform children_cb() callback is being erroneously
applied by the core gh_manager to graphics figure child axes properties for
the axes hgroup created in hgtransform()?

Why this problem in Octave 4.4.1 and not 4.2.2?

The pre-built Octave 4.2.2 executable is from package '4.2.2-1~octave~xenial2'
for Ubuntu 16.04 LTS. I built the 4.4.1 version using the
https://ftp.gnu.org/gnu/octave/octave-4.4.1.tar.gz source tar ball on 'Linux
4.15.0-43-generic #46~16.04.1-Ubuntu SMP Fri Dec 7 13:31:08 UTC 2018 x86_64
x86_64 x86_64 GNU/Linux' OS using default ./configure options.

Gary

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