[Octave-bug-tracker] [bug #47699] FLTK can segfault after using copyobj

[Philip Nienhuis]

Follow-up Comment #1, bug #47699 (project octave):

Instead of title-bar clicking the segfault can be triggered by "close all" as
well.

Running it on Windows (both using the GUI and the BASH shell, mxe-octave
configured with "--enable-devel-tools"), I get this:

octave:1> graphics_toolkit fltk
octave:2> demo ("copyobj", 1)
copyobj example 1:
:
< demo commands >
:

copyobj example 1: failed
varargin(1): out of bound 0
{END}


I could track it a little bit by manually executing the demo commands (finally
invoking debug_on_error(1)), to a call to line.m 
(copyobj.m L.87 -> struct2hdl.m L.144 -> struct2hdl.m.createline L.290 ->
line.m L.69)
where I think that just above that, in line.m L.56 the call to
__plt_get_axis_arg__ has reset varargin to empty. Why that happened is beyond
me; previous calls to line.m along this sequence in this demo all worked
well.

BTW in copyobj.m I see this syntax on L.52:

 for hp = hparent(:)'

Is that valid syntax?

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