lockscreen: Use temporary fix for black background

look-and-feel/contents/lockscreen/LockScreen.qml

@@ -8,6 +8,7 @@
 import QtQuick 2.12
 import QtQuick.Controls 2.15
 import QtQuick.Layouts 1.15
+import QtGraphicalEffects 1.12
 
 import org.kde.plasma.core 2.0 as PlasmaCore
 import org.kde.notificationmanager 1.1 as Notifications
@@ -42,6 +43,18 @@ PlasmaCore.ColorScope {
         passwordBar.textField.forceActiveFocus();
     }
     
+    // HACK: kscreenlocker doesn't draw the wallpaper (shows up as black)
+    Loader {
+        anchors.fill: parent
+        asynchronous: true
+        sourceComponent: FastBlur {
+            cached: true
+            radius: 0
+            source: wallpaper
+            anchors.fill: parent
+        }
+    }
+    
     // wallpaper blur 
     Loader {
         anchors.fill: parent