🍎 Add 'dark-mode-changed' event to app api

atom/browser/mac/atom_application_delegate.mm

@@ -24,6 +24,9 @@
   // Don't add the "Enter Full Screen" menu item automatically.
   [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"NSFullScreenMenuItemEverywhere"];
 
+  // Add observer to monitor the system's Dark Mode theme.
+  [[NSDistributedNotificationCenter defaultCenter] addObserver:self selector:@selector(darkModeChanged:) name:@"AppleInterfaceThemeChangedNotification" object:nil];
+
   atom::Browser::Get()->WillFinishLaunching();
 }
 
@@ -59,4 +62,8 @@
   return flag;
 }
 
+- (void)darkModeChanged:(NSNotification *)notify {
+  atom::Browser::Get()->DarkModeChanged();
+}
+
 @end