Added a way to read what the AI received from your sources (#1100)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/Tests/Tools/IndexedDocumentIdsTests.cs

@@ -41,6 +41,23 @@ public sealed class IndexedDocumentIdsTests
         Assert.That(IndexedDocumentIds.CreateChunkId(DATA_SOURCE_ID, source, 0), Is.EqualTo("7c9d2822-f9d1-a94e-8d83-30cea4f0856f"), "Files and mails which never moved must keep the ids they are stored under.");
     }
 
+    /// <remarks>
+    /// A document indexed again gets new chunk ids even when its fingerprint stays, as a mail's does,
+    /// so the new chunks never overwrite the old ones while those are still needed.
+    /// </remarks>
+    [Test]
+    public void TheChunkIdOfALaterGenerationIsPinned()
+    {
+        const string KEY = "/tmp/test-data/report.pdf";
+        var parentId = IndexedDocumentIds.CreateParentId(DATA_SOURCE_ID, KEY);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(IndexedDocumentIds.CreateChunkIdSource(DATA_SOURCE_ID, KEY, parentId, "3F9A0C"), Is.EqualTo("3F9A0C"), "The first generation gives the ids documents got before generations existed.");
+            Assert.That(IndexedDocumentIds.CreateChunkId(DATA_SOURCE_ID, IndexedDocumentIds.CreateChunkIdSource(DATA_SOURCE_ID, KEY, parentId, "3F9A0C", 1), 0), Is.EqualTo("10e9f029-bc45-a048-9db1-e5ac74777ddb"));
+        });
+    }
+
     [Test]
     public void TheChunkIdOfAMovedDocumentIsPinned()
     {