eclipse-platform#667 reports a crash in SWT.

There is a snippet provided here eclipse-platform#667 (comment) that reproduces the crash.

The task is:

• add printouts to the java and the native code (one should be able to distinguish both types!) to trace the callpath that leads to the crash, as it happens during expand the tree we need only this code path
• compile the native code and the java code
• execute the snippet and execute the provided steps e.g. using SWT Bot as an automation tool
• provide the output of the program until it crashes, a crash can be detected by the program is exit automatically while without a crash it runs
• IMPORTANT: If you can not follow the instructions strictly here do not try to use alternative ways but instead report back what does not work and what you would need (e.g. further instructions, more tools in the environment, ...)