[bug #68150] Axis labels should be displayable also for invisible axes objects

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Follow-up Comment #8, bug #68150 (group octave):

I realize that the patch makes one test in zlabel.m fail (I had only run tests
in graphics.cc).

hf = figure ("visible", "off");
unwind_protect
  view (3);
  hz = zlabel ("zlabel_string");
  assert (get (gca, "zlabel"), hz);
  assert (get (hz, "type"), "text");
  assert (get (hz, "visible"), "off");
  assert (get (hz, "string"), "zlabel_string");
  assert (get (hz, "color"), get (0, "defaultaxeszcolor"));
unwind_protect_cleanup
  close (hf);
end_unwind_protect


The reason why it passes before the patch is that it is currently the
responsibility of the renderer to switch labels visibility... Since the figure
visibility is "off", the renderer returns early and fails to to the switch.

To me this test looks simply makes no sense: when the view is 3D, the z-label
should be "visible", whether or not the figure is "visible" (or that would
mean that all objects in the figure should have their "visible" property "off"
for consistency...). I attached a patch in which I modified that test to
(rightfully) pass.

(file #58363)

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Additional Item Attachment:

Name: bug68150c.patch                Size: 5,8kio
    <https://file.savannah.gnu.org/file/bug68150c.patch?file_id=58363>


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