[openstreetmap/openstreetmap-website] Show tag changes in object history view (PR #6448)

[Minh Nguyễn]

1ec5 left a comment (openstreetmap/openstreetmap-website#6448)

The browse view currently <del>crosses out</del> any element that today is deleted or redacted, regardless of whether the changeset you’re viewing was responsible for deleting it. Otherwise, you wouldn’t see any crossed-out elements, since this PR only deals with tag changes. Eventually it would be just as useful to highlight changes to members or coordinates in the same manner. If so, we probably wouldn’t be able to rely on strikethrough to indicate both “this changeset removed this member” and “this member has since been deleted or redacted”.

> From my experiments, it appears to only show the feature id number and version. This avoid the issue with Chinese/etc scripts.

This is because most editors these days automatically remove all the tags when deleting an object (which just sets is visibility attribute). It remains possible to delete an object without deleting the tags using the raw API or [Level0](https://wiki.openstreetmap.org/wiki/Level0). Older editors like Potlatch used to keep the tags too, so one can still encounter crossed-out names and such. However, this is an edge case that I don’t think we need to be concerned about.

> Strikethrough is done with an <s> tag rather than a <del>. I don't see a counterpart <ins> or equivalent in added features.

#6558

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