To answer some of your feedback - there is a single Activity for the entire page. About the calculation of the URL, the reason behind URL recalculation each time was to be able to navigate to abc:id directly and bypass the entire problem with first going to abc:null and handling that scenario. The solution I try out is making abc:null unselected - no item will be selected at that point. Thanks for the feedback. I will keep the event based solution in mind for more complex scenarios. Eugen.
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