If a DisplayValue is tracking a variable that is not in the current scope it
should still be able to retrieve the value correctly.
This has been implemented, as confirmed by
2007-06-04 Adam Jocksch <email@example.com>
* TestDisplayValue.java (testVarMasked): Code added, still labelled as
(testVarNotInCurrentScope): Implemented, confirms bz#4577 as fixed.
(createDaemon): Refactored out of the testcases for simplicity.