fix(54283): Provide better UX when an invalid file is selected for 'move to file' refactoring (#54300)

src/server/protocol.ts

@@ -721,6 +721,7 @@ export interface RefactorEditInfo {
      */
     renameLocation?: Location;
     renameFilename?: string;
+    notApplicableReason?: string;
 }
 
 /**

src/server/session.ts

@@ -2709,7 +2709,8 @@ export class Session<TMessage = string> implements EventSender {
             return {
                 renameLocation: mappedRenameLocation,
                 renameFilename,
-                edits: this.mapTextChangesToCodeEdits(edits)
+                edits: this.mapTextChangesToCodeEdits(edits),
+                notApplicableReason: result.notApplicableReason,
             };
         }
         return result;