Fix Mac.

Author: Mysticial

SerialPrograms/Source/CommonFramework/Environment/SystemSleep_Apple.tpp

@@ -112,16 +112,22 @@ bool AppleSleepController::enable_sleep(){
 void AppleSleepController::update_state(){
     //  Must call under lock.
 
+    SleepSuppress before_state = m_state.load(std::memory_order_relaxed);
+    SleepSuppress after_state = SleepSuppress::NONE;
+
     //  TODO: Distiguish these two.
     bool enabled = m_screen_on_requests > 0 || m_no_sleep_requests > 0;
-    prevent_sleep();
-
-    m_state.store(
-        enabled
-            ? SleepSuppress::SCREEN_ON
-            : SleepSuppress::NONE,
-        std::memory_order_release
-    );
+    prevent_sleep(enabled);
+
+    after_state = enabled
+        ? SleepSuppress::SCREEN_ON
+        : SleepSuppress::NONE,
+
+    m_state.store(after_state, std::memory_order_release);
+
+    if (before_state != after_state){
+        notify_listeners(after_state);
+    }
 }