Don't react to psuedo Dark Mode on pre-Mojave unless AllowDarkModeOnUnsupportedOSes pref is set

code/apps/Managed Software Center/Managed Software Center/MSCAppDelegate.py

@@ -75,13 +75,13 @@ class MSCAppDelegate(NSObject):
         # without the Retina assets to avoid an appearance issue when the
         # icon has a badge in the Dock (and App Switcher)
         # Darwin major version 10 is Snow Leopard (10.6)
-        if os.uname()[2].split('.')[0] == '10':
+        if int(os.uname()[2].split('.')[0]) == 10:
             myImage = NSImage.imageNamed_("Managed Software Center 10_6")
             NSApp.setApplicationIconImage_(myImage)
 
         # if we are running under Mountain Lion or later set ourselves as a delegate
         # for NSUserNotificationCenter notifications
-        if os.uname()[2].split('.')[0] > '11':
+        if int(os.uname()[2].split('.')[0]) > 11:
             NSUserNotificationCenter.defaultUserNotificationCenter().setDelegate_(self)
 
         # have the statuscontroller register for its own notifications

code/apps/Managed Software Center/Managed Software Center/mschtml.py

@@ -24,9 +24,12 @@ from Foundation import NSString, NSLocalizedString, NSUTF8StringEncoding
 
 def interfaceStyle():
     '''Returns "dark" if using Dark Mode, otherwise "light"'''
-    interfaceType = NSUserDefaults.standardUserDefaults().stringForKey_("AppleInterfaceStyle")
-    if interfaceType == "Dark":
-        return "dark"
+    # running under Mojave or later or undocumented pref is set
+    if (int(os.uname()[2].split('.')[0]) >= 18 or
+            NSUserDefaults.standardUserDefaults().boolForKey_("AllowDarkModeOnUnsupportedOSes")):
+        interfaceType = NSUserDefaults.standardUserDefaults().stringForKey_("AppleInterfaceStyle")
+        if interfaceType == "Dark":
+            return "dark"
     return "light"
 
 def quote(a_string):