The `State: all-referrers-downloaded` is not always correctly updated downloading an area

[skyper]

What steps will reproduce the problem? ¶

1. Have a way node outside the download area which has at least to parent ways
2. Move the node sightly
   • No warning about moving a node without all referrers downloaded outside the downloaded area
3. Download a small BBox around the node including its original position
4. Select the node and one of its parent ways and unglue

What is the expected result? ¶

No warning about unknown referrers

What happens instead? ¶

Unglue confirmation about other referrers not yet downloaded

Please provide any additional information below. Attach a screenshot if possible. ¶

The problem seems to be that the state for modified nodes is not properly set as the node indeed still has State: referrers-not-all-downloaded modified

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2024-08-07 18:48:03 +0200 (Wed, 07 Aug 2024)
Revision:19173
Build-Date:2024-08-08 01:30:33
URL:https://josm.openstreetmap.de/svn/trunk

[taylor.smock]

Root cause might be the same as #23810.

[taylor.smock]

In 19175/josm:

Fix #23846: Setting all referrers downloaded doesn't happen if the target object has been modified

This may also fix (or partially fix) #23808 and #23810.