Description of the bug
When creating a User compare context (to compare my user account to the user account for the profile page I am viewing, for example) I noticed that even though contexts were marked as required, the visibility condition is still visible in the drop-down menu.
This new visibility condition has two required user contexts, so should not be available on any path without a user context (the second user context is global $user and is always available). Yet it appears in the select list for the home page layout.

Steps To Reproduce
To reproduce the behavior: 1. Apply the patch from https://github.com/backdrop/backdrop-issues/issues/4029 2. Manage blocks on the home page layout 3. Attempt to add a visibility condition
Actual behavior
- Confirm that
User: compareappears in the list
Expected behavior
Since User: compare appears in the list has required contexts that are not present, User: compare should NOT appear in the list of available visibility conditions
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