fix titlebar color on macOS dark theme

desktop/app.js

@@ -66,6 +66,7 @@ app.on('window-all-closed', () => {
 app.on('ready', () => {
     appReady = true;
     setAppOptions();
+    setSystemAppearance();
     createMainWindow();
     setGlobalShortcuts();
     subscribePowerEvents();
@@ -147,6 +148,14 @@ function readAppSettings() {
     }
 }
 
+function setSystemAppearance() {
+    if (process.platform === 'darwin') {
+        if (electron.systemPreferences.isDarkMode()) {
+            electron.systemPreferences.setAppLevelAppearance('dark');
+        }
+    }
+}
+
 function createMainWindow() {
     const appSettings = readAppSettings();
     const windowOptions = {

release-notes.md

@@ -5,6 +5,7 @@ Release notes
 `+` xml files can be now opened as regular files  
 `-` fix #1154: relative Destination header in WebDAV MOVE  
 `-` fix #1129: webdav storage error on Unicode filenames  
+`-` fix titlebar color on macOS dark theme  
 
 ##### v1.9.3 (TBD)
 `-` fixed group settings not being displayed