Add test case for issue #1793 Cloning problems with LexicalPreserving…

[jlerbsc]

…Printer (using 3.6.18)

Fixes #1793.

[jlerbsc]

@maartenc There are errors in this build which are not related to my work! have you an idea? Perhaps it's related to line separator.
There are also many java.lang.OutOfMemoryError: GC overhead limit exceeded

[maartenc]

@jlerbsc : just a guess, but in the testcase you use some static method to configure things, which might have an influence on the other junit tests. Maybe this setup requires more memory?

StaticJavaParser.setConfiguration(new ParserConfiguration().setLexicalPreservationEnabled(true));
CompilationUnit cu = StaticJavaParser.parse(src);
LexicalPreservingPrinter.setup(cu);

Could you try to rewrite to testcase to avoid the usage of these static methods? (I don't know if it's possible, I don't have the code in front of me).