[rotation] prevent LockScreen from rotating

src/qml/MainScreen.qml

@@ -78,6 +78,7 @@ Page {
     orientation: Lipstick.compositor.screenOrientation
 
     onOrientationChanged: {
+        if (!lockscreenVisible())
             glacierRotation.rotateRotationParent(orientation)
     }
 
@@ -90,6 +91,17 @@ Page {
         Lipstick.compositor.screenOrientation = nativeOrientation
     }
 
+    Connections {
+        target: LipstickSettings
+        onLockscreenVisibleChanged: {
+            if (lockscreenVisible()) {
+                glacierRotation.rotateRotationParent(nativeOrientation)
+            } else {
+                glacierRotation.rotateRotationParent(desktop.orientation)
+            }
+        }
+    }
+
     function lockscreenVisible() {
         return LipstickSettings.lockscreenVisible === true
     }