NullPointerException in cluster layout about scxmlgui HOT 8 CLOSED

committed a quick fix to eliminate the null pointer exception.
however the layout is not correct. opening the top-level will not display the 
complete graph (the 3rd level is missing). Opening the second level instead 
displays correctly also the third level.

Note also that opening the top level does not present state B_AAAAAAAA_CCCC, 
which is part of the 2nd level, and detailed in the 3rd level.

the problem seems to be caused by level 3 redefining a node already defined in 
level 2.

the problematic node is the top level node in level 3: B_AAAAAAAA_CCCC

fixed in revision 61 by notifying the user when a child node is the same as its 
parent.

Note that before this fix, level 2 was also redefining a node (the top level 
node in level 2: "2nd_level"), but there was no problem displaying level 2 
correctly in the editor.
The fix I targeted was expanding this behavior for deeper nesting levels.
However, the actual fix made things worse, as it does not allow using xinclude 
in a convenient way.
Let me explain:
I am interested in the ability to separate child states to different files, and 
still keep the ability to load each file separately in the editor. This means 
that each nested level should be defined as a full state.
I tried moving the whole child state to a separate file, leaving only the 
xi:include statement at the parent level. However, transitions in the child 
file pointing to sibling states caused an error when trying to load the editor, 
as the editor did not find these sibling states in the child file (they are 
defined in the parent file).
So I kept in the parent file only a portion of the child state containing the 
transitions to its siblings, and separated the rest of the child state to a 
different child file. However, this created a child file which is not a 
complete state, and cannot be loaded in the editor. 
Then I found out that wrapping the contents of the child file with the child 
state (or redefining it as you mentioned) worked with one nesting level, but 
not with two levels.
I would appreciate any fix that will enable both loading the top file, and each 
nested level.

revision 62 should allows for what you are asking. Let me know if it still 
doesn't.

This fix is indeed what I was asking for. Thanks.
I noticed another exception happening when:
opening the top level, collapsing the cluster state, and selecting auto layout.
The layout is changed correctly, but a NullPointer exception is thrown (see 
attached log).