[josm-dev] Seeking comments on patch for making merge/download undoable

[Josh Doe]

I created this ticket a while ago, and have had a patch up for a
little over a week, but haven't had any comments regarding if this
functionality is even desired by anyone, is implemented in a decent
manner, etc. I'll be using this functionality in the conflation
plugin, though I'll probably just copy DataSetMerger to the plugin
until the patch has been thoroughly reviewed and tested.

https://josm.openstreetmap.de/ticket/7489

Thanks,
-Josh