Manually adding members to an item list may not show all members that can be added

[Nicklas Nordborg]

The default mode when selecting items is that the logged in user must have USE permission and there is automatically a filter applied when listing items.

For item lists it is enough to have READ permission but the default filtering may hide items that should be selectable.

[Nicklas Nordborg]

In 8297:

Fixes #2330: Manually adding members to an item list may not show all members that can be added