Id: Smart handling of `key=value` when pasting tags

[tordans]

This is a feature request.
The goals is to make it easier to paste tags from the wiki.
The iD editor could behave smarter in this situation with a very nice UX touch.

Workflow

1. I tag something, eg leisure=garden from the search bar
2. I click on the wiki-link to learn how to tag details that are not part of the presets
3. I learn about garden:type and copy the tag garden:type=castle from the wiki page
4. I go back to iD editor and paste garden:type=castle into a new tag on "all tags".

Current behavior:

The copied text shows up as key. I have to manually split it and remove the "=".

Expected / nicer behavior:

1. iD Editor recognizes that I copied a key-value-pair and splits the pair at the "="-sign into key and value.
2. It then add a new blank tag pair below and thereby completes the tagging and the (i) and such show up next to my tag

[bhousel]

I like this suggestion 👍

[AndreasHae]

I'm going to work on this

[tordans]

A quick thank-you-feedback @AndreasHae: I used it the other day and it was awesome ❤️. Thanks for adding this.