AllPosts page: Post category can't be removed by "Edit" bulk action

[antonrinas]

STEPS TO REPRODUCE

1. Log in as administrator. Create new category for posts "Test category".
2. Create new post "test post" and assign it to categories "Uncategorized", "Test category".
3. Go to AllPosts page. Check "test post" and make "Edit" bulk action.
4. In "Categories" list select "Test category". "Uncategorized" is not checked.
5. Click "Update".

EXPECTED RESULT: "test post" is assigned only to "Test category".
ACTUAL RESULT: "test post" is assigned to "Test category" and "Uncategorized".

[wpnook]

As far as I've known, this is the intended behavior. The current UI does not really support the bulk editing of potentially dozens or hundreds of post. It's not a tool to manage your post's categories, but to assign them in bulk. I'm going to create a new ticket that deals with the label verbiage so that it's easier to understand.

[SergeyBiryukov]

Thanks for the report, we're already tracking this issue in #11302.

In the meantime, ​Batch-Move Posts plugin might be helpful.