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Since there is a public API to access JDI information (debuggerjpda/api), there is no reason why the models and filters are split accross two modules (debuggerjpda and debuggerjpda/ui). The UI should be contained in one module - it would be also easier to grasp the cooperation between individual models.
Scheduling for future, although it would be good to have it in 4.2.
This was actually fixed by issue #249054.