Requested feature overview description.
Close any currently open "Post updated" #notice when you update additional posts in Edit posts mode. Here is the code:
https://e621.net/forum/show/176291
Why not display "Updated posts (1 pending)..." instead like other modes? Because the tags textarea is closed at the same time.
Why would it be useful?
If you do multiple tag edits and don't keep closing the "Post updated" notice, you don't know if the latest tag edit was successful. This can cause you to skip tag edits.
What part(s) of the site page(s) are affected?