Lock session on screen blanking

src/main.rs

@@ -148,6 +148,16 @@ impl State {
         }
     }
 
+    // Fade surfaces on all outputs have finished fading out
+    fn fade_done(&mut self) {
+        if let Some(command) = self
+            .system_actions
+            .get(&shortcuts::action::System::LockScreen)
+        {
+            crate::run_command(command.to_string());
+        }
+    }
+
     fn update_suspend_idle(&mut self, is_idle: bool) {
         if is_idle {
             // TODO: Make command configurable