Add power=connection to validator and preset?

[Gazer75]

Would help avoid some misunderstanding and make validation easier.
Had some people "fix" some of these as they didn't know these types of connections were a thing.

[skyper]

For the preset part, please take aa look at #17034.
Regarding validator, I do not understand about which warning you talk about. Do you have an example, please.

[harahu]

For reference, this is the changeset discussion that lead to this ticket: ​113392283. I am the person who (wrongly) changed the original mapping, due to the combination of the Missing power tower/pole within power line warning from JOSM and not knowing that suspended (no pole/tower) connections exists.

In said changeset, there are two nodes where this ticket is relevant as of now:

• ​7845817756, v4
• ​7845817757, v4

I added the power=connection tag as a consequence of the above changeset discussion in a later ​changeset.

As I mention at the end of the conversation:

• I, at least, specifically would like the Missing power tower/pole within power line warning to go away when two distinct lines are connected using power=connection.
• You might also want to reword the error message, specifically for untagged nodes connecting distinct lines, in order to also suggest this power=connection tag, in addition to power=tower and power=pole.

Although, this latter point might be more controversial, given that the tag is not approved yet. It might not be a strong argument, but power=connection seems like one of the less controversial suggestions in the ​proposal from 2014, mentioned in ticket 17034, having even been ​suggested by reviewers in the discussion, and added to the proposal as a response to the suggestion, with no clear opposition on this point. Another issue mentioned in ticket 17034 is the lack of a wiki article. This seems resolved now, with a fairly high-quality article describing the tag and phenomena: ​https://wiki.openstreetmap.org/wiki/Tag:power%3Dconnection

My reasoning for the first part of my proposal above is as follows:
Even though power=connection isn't approved yet, it is a pretty clear statement that there really is no power=tower or power=pole at the location of the node, and that no other mapper should tag a connecting node with one of these tags. It also implies that the node connecting the lines should not be removed. Hence, there shouldn't really be a warning associated with the node, as is the case today.

[Klumbumbus]

Closed as duplicate of #17034.