[openstreetmap/openstreetmap-website] Add changeset upload modifiers (#1389)

mmd notifications at github.com
Thu Mar 8 07:06:42 UTC 2018

> A more ambitious way to improve the reverting of edits would be extending the changeset upload to allow a "revert" block that can revert objects to earlier versions without actually transmitting the full earlier version

I'm not sure this is really an issue. On a decent internet connection, uploading large changesets only takes a rather small fraction of the total processing time, the rest is spent on processing Rails code.

This will significantly improve once changeset upload is available via cgimap (https://github.com/zerebubuth/openstreetmap-cgimap/issues/140). Mass downloading all of those objects to be reverted before uploading would be needed anyway to at least determine the current version numbers.

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