lock: fix dpms fade surface getting stuck after unlock

port 1.5

(cherry picked from commit 116cef0b3a)

quickshell/DMSShell.qml

@@ -139,6 +139,14 @@ Item {
                         return;
                     fadeDpmsWindowLoader.loadedWindow.cancelFade();
                 }
+
+                function onMonitorsOffChanged() {
+                    if (IdleService.monitorsOff)
+                        return;
+                    if (!fadeDpmsWindowLoader.loadedWindow)
+                        return;
+                    fadeDpmsWindowLoader.loadedWindow.dismiss();
+                }
             }
         }
     }

quickshell/Modules/Lock/FadeToDpmsWindow.qml

@@ -4,6 +4,7 @@ import QtQuick
 import Quickshell
 import Quickshell.Wayland
 import qs.Common
+import qs.Services
 
 PanelWindow {
     id: root
@@ -65,10 +66,23 @@ PanelWindow {
     }
 
     function cancelFade() {
+        dismiss();
+        fadeCancelled();
+    }
+
+    function dismiss() {
         fadeSeq.stop();
         fadeOverlay.opacity = 0.0;
         active = false;
-        fadeCancelled();
+    }
+
+    Connections {
+        target: IdleService
+        function onIsShellLockedChanged() {
+            if (IdleService.isShellLocked)
+                return;
+            root.dismiss();
+        }
     }
 
     MouseArea {

quickshell/Modules/Lock/Lock.qml

@@ -335,6 +335,7 @@ Scope {
             notifyLockedHint(sessionLock.secure);
             if (!sessionLock.secure)
                 return;
+            IdleService.dismissFadeToLock();
             lockRetryAttempts = 0;
             pendingLock = false;
             if (lockPowerOffArmed && powerOffOnLock)