audrasjb 943e956379 Feeds: Use latest comment date for the Last-Modified header of comments feed. ...

Previously, the `Last-Modified` header of comments feed was using the date/time of the last comment. This behavior was breaking caching and causing feed readers to believe there is no new content even when there might be new posts.

This commit changes this behavior to use the newest date from both `get_lastcommentmodified()` and `get_lastpostmodified()` functions instead of only using the result from `get_lastcommentmodified()`.

Props xiven, mauteri, costdev, audrasjb.
Fixes #47968.

Built from https://develop.svn.wordpress.org/trunk@53233


git-svn-id: http://core.svn.wordpress.org/trunk@52822 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2022-04-20 12:47:11 +00:00

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