Revert save panel workaround

# Conflicts:
#	CHANGELOG.md

CHANGELOG.md

@@ -7,6 +7,7 @@ Change Log
 
 ### Fixes
 
+- Fix an issue that documents could not be saved with an unknown file extension.
 - Fix an issue that the Share button in the Touch Bar did not work when the document was replaced with the initial empty document.
 
 

CotEditor/Sources/Document.swift

@@ -536,6 +536,13 @@ final class Document: NSDocument, AdditionalDocumentPreparing, EncodingHolder {
         accessoryView.ensureFrameSize()
         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
     }