Revert save panel workaround

CHANGELOG.md

@@ -13,6 +13,11 @@ Change Log
 - [beta] Adjust layout in the syntax editor.
 
 
+### Fixes
+
+- Fix an issue that documents could not be saved with an unknown file extension.
+
+
 
 4.6.0-beta.2 (583)
 --------------------------

CotEditor/Sources/Document.swift

@@ -543,6 +543,13 @@ final class Document: NSDocument, AdditionalDocumentPreparing, EncodingHolder {
         accessoryView.sizingOptions = .intrinsicContentSize
         savePanel.accessoryView = accessoryView
         
+        // let save panel accept any file extension
+        // -> Otherwise, the file extension for `.allowedContentTypes` is automatically added
+        //    even when the user specifies another one (macOS 14, 2023-09).
+        DispatchQueue.main.async { [weak savePanel] in
+            savePanel?.allowedContentTypes = []
+        }
+        
         return true
     }