Add no changes error code in NKError extension

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

shell_integration/MacOSX/NextcloudIntegration/FileProviderExt/Extensions/NKError+Extensions.swift

@@ -17,6 +17,12 @@ import FileProvider
 import NextcloudKit
 
 extension NKError {
+    static var noChangesErrorCode: Int {
+        get {
+            return -200
+        }
+    }
+
     var isCouldntConnectError: Bool {
         get {
             let nkErrorCode = self.errorCode
@@ -52,6 +58,12 @@ extension NKError {
         }
     }
 
+    var isNoChangesError: Bool {
+        get {
+            return self.errorCode == NKError.noChangesErrorCode
+        }
+    }
+
     func toFileProviderError() -> NSFileProviderError {
         if self.isNotFoundError {
             return NSFileProviderError(.noSuchItem)