Outbound data restrictions after searching data sources (#1106)

app/MindWork AI Studio/Settings/DataModel/OutboundDataRequirement.cs

@@ -5,12 +5,12 @@ namespace AIStudio.Settings.DataModel;
 /// </summary>
 /// <remarks>
 /// The source travels along so a tool which is kept from running can name it, and the user
-/// learns what stands in the way. For a mailbox, the reference is its id rather than its name,
-/// because a mailbox may be renamed after a chat read from it.
+/// learns what stands in the way. For a mailbox or a data source, the reference is its id rather
+/// than its name, because either may be renamed after a chat read from it.
 /// </remarks>
 /// <param name="Restriction">Where the chat may still send data.</param>
 /// <param name="Origin">What kind of source demands the restriction, or NONE when nothing restricts the chat.</param>
-/// <param name="Reference">Which source of its kind demands the restriction: the id of a mailbox, or the host of a private web page. An empty text when the kind says it all, as for the wiki, or when nothing restricts the chat.</param>
+/// <param name="Reference">Which source of its kind demands the restriction: the id of a mailbox or of a data source, or the host of a private web page. An empty text when the kind says it all, as for the wiki, or when nothing restricts the chat.</param>
 public sealed record OutboundDataRequirement(OutboundDataRestriction Restriction, OutboundDataOrigin Origin, string Reference)
 {
     /// <summary>
@@ -25,9 +25,15 @@ public sealed record OutboundDataRequirement(OutboundDataRestriction Restriction
     /// <remarks>
     /// On a tie, this one is kept, whatever the origin of either, so the source which set a level
     /// first stays the one which is named, and a chat does not name another source with every
-    /// search.
+    /// search. A restriction this version does not know counts as the strictest one, and the
+    /// requirement which wins carries that one instead.
     /// </remarks>
     /// <param name="other">The other requirement.</param>
     /// <returns>The requirement whose restriction is the stricter one.</returns>
-    public OutboundDataRequirement StricterOf(OutboundDataRequirement other) => other.Restriction < this.Restriction ? other : this;
+    public OutboundDataRequirement StricterOf(OutboundDataRequirement other)
+    {
+        var stricter = other.Restriction.OrStrictestWhenUnknown() < this.Restriction.OrStrictestWhenUnknown() ? other : this;
+        var knownRestriction = stricter.Restriction.OrStrictestWhenUnknown();
+        return knownRestriction == stricter.Restriction ? stricter : stricter with { Restriction = knownRestriction };
+    }
 }