             self.fileAttributes = try? FileManager.default.attributesOfItem(atPath: url.path)  // FILE_READ
             
             // store file data in order to check the file content identity in `presentedItemDidChange()`
-            if let data = try? Data(contentsOf: url) {  // FILE_READ
-                self.fileData = data
-            }
+            self.fileData = self.lastSavedData
             
             // store file encoding for revert
             self.readingEncoding = encoding

    private var suppressesIANACharsetConflictAlert = false
    @objc private dynamic var isExecutable = false  // bind in save panel accessory view
    
    
    
    // MARK: -

            data = data.addingUTF8BOM
        }
        
        // keep to swap later with `fileData`, but only when succeed
        self.lastSavedData = data
        
        return data
    }
    
