I actually closed the bug. It is resolved in version 6.0.0 and higher.
However, for a long time a broken version of scilab was distributed that
had a non working xcos.
At least working with hierarchy wasn't possible.

I still think that mixing the new jogl2 namespace functionality upstream is
a good idea.

2018-02-22 10:39 GMT-03:00 Johan Wesselink <johanwesselin...@gmail.com>:

> Hi,
> I would like to introduce myself.
> On this moment iI have some spare time to commit to SciLAB.
> I used it extensively and was very pleased when version 6.0 arrived.
> However, this version has some very annoying bugs. Especially in xcos.
> One option is to complain about this. But I prefer to try and fix some of
> these bugs.
> I would like to work a little on xcos. I already reported a bug on
> bugzilla, but
> until now did not see any response to that. This is a simple bug in which
> creating levels of hierarchy will lead to a crash. This only happens by
> three or more levels.
> I reported it and made a patch for it.
> http://bugzilla.scilab.org/show_bug.cgi?id=15156
> Due to the nature of this bug it is hard to write a test for it. I will
> have a look into generating xcos diagrams from within a scripts. Hopefully
> I will find a way to make a scripts that provokes the error.
> Further I tried to build the newest version (git master). But there are
> many problems with the modules scirendrerer and gui. The reason for this is
> that in jogl2 version 2.3.2 the name space javax.media was replaced with
> com.jogamp. After some searching and reading I noticed that most
> distributions fix this problem by patching the necessary java files.
> Therefor I would like to start a discussion to port this patch into the
> repository of Scilab. I know this is not my place, but I think it is
> necessary to speak about this.
> It is very interesting to look at the really well structured and build
> code of Scilab. It is a joy to work with and look at.
> I hope that I can make some contributions to the source and improve the
> overall user experience.
> Johan
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