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When using rsync synchronization, path mapping should be automatic. Not it isn't.
There is no rsync option now; but anyhow synchronization is now designed in such a way that it is pluggable synchronizer who is responsible for that; so path mapper pops up only when user selects "Sharing" synchronization. If "SCP" synchronizer is selected, no Path Mapper pops up. So I believe this is fixed now.