Update asset addresses after import completes, not during import

Author: desplesda

CHANGELOG.md

@@ -10,6 +10,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Changed
 
+- `YarnProjectImporter` now updates asset addresses after the project import completes, rather than during the import.
+
 ### Removed
 
 ## [3.1.3] 2025-12-09

Editor/Importers/YarnProjectImporter.cs

@@ -1112,15 +1112,37 @@ private void CreateYarnInternalLocalizationAssets(AssetImportContext ctx, YarnPr
                     foreach (var (id, asset) in assetPaths)
                     {
                         newLocalization.AddLocalizedObjectToAsset(id, asset);
+                    }
+
 #if USE_ADDRESSABLES
-                        if (newLocalization.UsesAddressableAssets)
+                    // If we're using addressable assets, make sure that the
+                    // assets we just added have an address. Do this after the
+                    // import completes, because we're not allowed to modify the
+                    // addressable asset settings in the middle of an import.
+                    if (newLocalization.UsesAddressableAssets)
+                    {
+                        EditorApplication.delayCall += () =>
                         {
-                            // If we're using addressable assets, make sure that
-                            // the asset we just added has an address
-                            LocalizationEditor.EnsureAssetIsAddressable(asset, Localization.GetAddressForLine(id, localisationInfo.languageID));
-                        }
-#endif
+                            var assetCount = assetPaths.Count();
+                            int count = 0;
+
+                            foreach (var (id, asset) in assetPaths)
+                            {
+                                // Updating asset addresses can take time, so
+                                // show a progress bar that the user can cancel.
+                                var cancelled = EditorUtility.DisplayCancelableProgressBar("Updating Dialogue Asset Addresses", asset.name, count / (float)assetCount);
+                                if (cancelled)
+                                {
+                                    Debug.LogWarning("Cancelled updating dialogue asset paths.");
+                                    break;
+                                }
+                                LocalizationEditor.EnsureAssetIsAddressable(asset, Localization.GetAddressForLine(id, localisationInfo.languageID));
+                                count += 1;
+                            }
+                            EditorUtility.ClearProgressBar();
+                        };
                     }
+#endif
 
 #if YARNSPINNER_DEBUG
                     stopwatch.Stop();