YarnProjectImporterEditor: Update asset addresses after import completes, not during import

Author: desplesda

CHANGELOG.md

@@ -33,6 +33,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - renamed the test asmdef files from `YarnSpinnerTests.x` to `YarnSpinner.Unity.Tests.X` so that they are matched by the existing filters.
 - Generated YSLS file now matches the newer schema, see the YS core repo for details of this
 - When matching assets to line IDs the importer now prefers exact matches to the line ID
+- `YarnProjectImporterEditor` now resets some internal state when creating its UI, which should help avoid a bug where the list of sources would grow over time.
 
 ### Removed
 

Editor/Editors/YarnProjectImporterEditor.cs

@@ -260,6 +260,9 @@ public override VisualElement CreateInspectorGUI()
 
             var importData = yarnProjectImporter.ImportData;
 
+            sourceEntryFields.Clear();
+            localizationEntryFields.Clear();
+
             var ui = new VisualElement();
             uiRoot = ui;