5 terminal.test TerminalsViewReorderTest failures since I20260610-1800

[iloveeclipse]

Regression from 1a1fa26 / #2679.

See https://download.eclipse.org/eclipse/downloads/drops4/I20260610-1800/reports.html#tests

Looks like test setup is not working properly on SDK builds.

[iloveeclipse]

@vogella : could you please fix the failures?

[vogella]

Unfortunately I don't know how to set the Ant setup for the aggregator build but the change uses the same approach as other Workbench tests, so I assume this should fix the test failures.