Fix window opacity in fullscreen mode

CHANGELOG.md

@@ -10,6 +10,11 @@ Change Log
 - Minimize scrolling when focusing a text such as in text search and outline selection.
 
 
+### Fixes
+
+- Fix an issue that the navigation bar tinted wrongly when the document window is in fullscreen and the editor is non-opaque. 
+
+
 
 4.0.5 (463)
 --------------------------

CotEditor/Sources/DocumentWindow.swift

@@ -8,7 +8,7 @@
 //
 //  ---------------------------------------------------------------------------
 //
-//  © 2014-2020 1024jp
+//  © 2014-2021 1024jp
 //
 //  Licensed under the Apache License, Version 2.0 (the "License");
 //  you may not use this file except in compliance with the License.
@@ -46,8 +46,9 @@ final class DocumentWindow: NSWindow {
         didSet {
             backgroundAlpha = backgroundAlpha.clamped(to: 0.2...1.0)
             
+            guard !self.styleMask.contains(.fullScreen) else { return }
+            
             self.isOpaque = (backgroundAlpha == 1.0)
-            self.backgroundColor = self.isOpaque ? nil : self.contentBackgroundColor.withAlphaComponent(backgroundAlpha)
             
             self.invalidateShadow()
             self.contentView?.needsDisplay = true
@@ -85,6 +86,8 @@ final class DocumentWindow: NSWindow {
             
             guard isOpaque != oldValue else { return }
             
+            self.backgroundColor = isOpaque ? nil : self.contentBackgroundColor.withAlphaComponent(self.backgroundAlpha)
+            
             self.invalidateTitlebarOpacity()
             
             if isOpaque {