Change emails include whole table, rather than extracting local context

Some of our Confluence wiki pages have fairly long tables on them.

When the system generates a "change" email to notify watchers of changes to those pages, it always includes the whole table in the email, instead of picking out just the changed section. This can make the change very hard to find if the table has more than a handful of rows (some of our tables have 100+ rows).

I would expect the system to pick out just the changed areas of table-heavy pages, as it does for text-only pages.

Repro steps

Create a Confluence page with a table which has 100 rows.
As user A, subscribe to updates to this page.
As user B, edit row #75 in the table.
As user A, check for a page changed email

Expected outcome

User A should receive an email clearly showing that user B has edited row #75. Some nearby context may be included in the email to aid comprehension, but no more than a handful of nearby rows should be included.

Observed outcome

User A receives an email with all 100 rows of the table. Row #75 is highlighted in pale green to show the edit, but this is very hard to find in such a long email.

Affected versions

Atlassian Confluence 5.2