Post History

Highlighting for tag diffs

In the diff for tags (as seen in a suggested edit, or in the edit history), the tags before editing are shown on the left, and the tags after editing are shown on the right. However, unlike the text diffs for the title and body, the diff for the tags shows no indication of which tags were removed, and which were added.

When there is a simple change, such as adding a single tag, this is still clear:
![Tag diff showing the tag "bug" on the left and two tags "bug" and "test" on the right](https://meta.codidact.com/uploads/8udqhlmrvvod4wcm9wfur80907iv)

However, when the total number of tags does not change due to adding and removing the same number of tags, and the added and removed tags are similar (which seems likely to be common), it is not immediately obvious which parts of the diff have changed, or how many tags have been replaced:

![Tag diff showing 5 tags on both sides that look similar. Left shows "bug", "test", "tag", "post", "comment". Right shows "bug", "tag", "post", "comment", "text".](https://meta.codidact.com/uploads/cxpubsx6n18tz3hgj7jn5szv41v8)

Spot the differences.

Tag diffs would be easier to read if they had similar highlighting to the title and body diffs.