Set automatic termination programatically (fix #1183)

CHANGELOG.md

@@ -5,6 +5,10 @@ Change Log
 4.0.5 (unreleased)
 --------------------------
 
+### Fixes
+
+- Fix an issue that the application did not terminate when all windows are closed.
+
 
 
 4.0.4 (461)

CotEditor/Sources/AppDelegate.swift

@@ -86,6 +86,10 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         UserDefaults.standard.register(defaults: defaults)
         NSUserDefaultsController.shared.initialValues = defaults
         
+        // -> Setting `NSSupportsAutomaticTermination` in Info.plist
+        //    doesn't work somehow (2021-06)
+        ProcessInfo.processInfo.automaticTerminationSupportEnabled = true
+        
         // instantiate shared instances
         _ = DocumentController.shared
         _ = TextFinder.shared