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The fix of bug #200698 means you can conveniently associate sources with a binary root in some circumstances in the UI, notably Go to Declaration or other cases where a *.class disassembly is opened in the editor. But if your first encounter with the lack of sources for a JAR is stepping into one of its methods in the debugger, you might not find this. When the debugger is asked to step into a method for which no sources are currently available, it ought to call SourceJavadocAttacher in case the user can supply sources.
Thnaks, I'll look at it.