Misleading warning when editing the page_for_posts page

[karmatosed]

Whilst I was using Twenty Seventeen, I discovered some unusual page locking. It seemed the blog page was locked and I was unable to edit it, despite it being apparently not locked. I've not experienced this before and whilst it feels like a rare experience, I wanted to bring it to attention incase there was something deeper wrong.

​Here is the video.

Along with this, I experienced a further issue that I almost feel needs another ticket but going to throw it in together. I found I could upload and change featured images, despite a page lock. This felt weird and something I'd expect to not be able to happen.

Note: I can't see a pages component so putting under posts but unsure if correct placement.

[swissspidy]

This is not a page lock, just a warning that one is editing the page_for_posts page which is special in WordPress as it displays the latest posts, not some static content. See #17470.

Not sure if/how the wording could be improved.

[cathibosco1]

In reviewing the text - we suggest the following

You are attempting to edit a placeholder page that lists your latest blog posts.

In place of:

You are currently editing the page that shows your latest posts.