Support for multiple tags on changeset.

[Krakonos]

It was suggested in old redmine bug 3339, by Jonathan Bennett:

The API supports an arbitrary number of tags on changesets, but Merkaartor currently only allows the user to enter a description. Could a tag editor be added to the upload dialog?

[Krakonos]

I have found only one instance of tag that makes sense, and that is source=*; is there some other use case for this feature?

[joernheissler]

There are several other tags:

• https://wiki.openstreetmap.org/wiki/Changeset#Tags_on_changesets
• https://wiki.openstreetmap.org/wiki/Proposed_features/changeset_tags

Second link says "Wherever and whenever possible, editor softwares (or plugin software) should try to add those tags automatically."

For some tags this is possible, e.g. created_by or imagery_used. Other tags need to be filled manually. I think that a tag editor as suggested originally would be best. Merkaartor could auto fill some values (e.g. created_by) and let the user add/modify others. Auto completion for common keys or key-value pairs could be added too.