[stable-33.0] fix: Refactor visitedDirectory handling in MaterializedEnumerationObserver

shell_integration/MacOSX/NextcloudFileProviderKit/Sources/NextcloudFileProviderKit/Enumeration/MaterializedEnumerationObserver.swift

@@ -97,7 +97,16 @@ public class MaterializedEnumerationObserver: NSObject, NSFileProviderEnumeratio
             logger.info("Updating item state to dataless.", [.name: metadata.fileName, .item: evictedItemIdentifier])
 
             metadata.downloaded = false
-            metadata.visitedDirectory = false
+
+            // Being absent from enumeratorForMaterializedItems only means the item has no
+            // local materialized content. For directories, visitedDirectory is our refresh
+            // subscription: if Finder has enumerated a folder before, keep watching it for
+            // remote child changes even when macOS reports it as dataless. This matters for
+            // shared mount roots, which may be omitted from materialized items after browsing.
+            if !metadata.directory {
+                metadata.visitedDirectory = false
+            }
+
             dbManager.addItemMetadata(metadata)
         }
 

shell_integration/MacOSX/NextcloudFileProviderKit/Tests/NextcloudFileProviderKitTests/MaterialisedEnumerationObserverTests.swift

@@ -130,8 +130,8 @@ final class MaterialisedEnumerationObserverTests: NextcloudFileProviderKitTestCa
             XCTAssertTrue(finalItemC?.downloaded ?? false, "itemC should remain downloaded.")
 
             let finalDirD = dbManager.itemMetadata(ocId: "dirD")
-            XCTAssertFalse(
-                finalDirD?.visitedDirectory ?? true, "dirD should now be marked as not visited."
+            XCTAssertTrue(
+                finalDirD?.visitedDirectory ?? false, "dirD should be marked as visited."
             )
 
             expect.fulfill()