Switch DropShadow for RectangularGlow on lockscreen to improve performance

DropShadow requires actually sampling and blurring the source element, while RectangularGlow just creates a generic rectangle without caring about the source element. This greatly improves the speed of everything on the lockscreen, especially notifications (they aren't a laggy mess when you have a ton of them now)

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

@@ -133,6 +133,16 @@ Rectangle {
         }
     }
     
+    RectangularGlow {
+        anchors.topMargin: 1
+        anchors.fill: topTextDisplay
+        cached: true
+        glowRadius: 4
+        spread: 0.2
+        color: keypadRoot.dropShadowColor
+        opacity: (Math.sin(2*((Math.PI / 2) * keypadRoot.swipeProgress + 1.5 * Math.PI)) + 1)
+    }
+    
     // rectangle "bar" on the top of the keypad
     Rectangle {
         id: topTextDisplay
@@ -144,18 +154,6 @@ Rectangle {
         opacity: (Math.sin(2*((Math.PI / 2) * keypadRoot.swipeProgress + 1.5 * Math.PI)) + 1)
     }
     
-    DropShadow {
-        anchors.fill: topTextDisplay
-        source: topTextDisplay
-        cached: true
-        horizontalOffset: 0
-        verticalOffset: 1
-        radius: 4
-        samples: 6
-        color: keypadRoot.dropShadowColor
-        opacity: (Math.sin(2*((Math.PI / 2) * keypadRoot.swipeProgress + 1.5 * Math.PI)) + 1)
-    }
-    
     // pin dot display
     Item {
         anchors.verticalCenter: topTextDisplay.verticalCenter
@@ -227,6 +225,17 @@ Rectangle {
                     Layout.fillWidth: true
                     Layout.fillHeight: true
 
+                    RectangularGlow {
+                        anchors.topMargin: 1
+                        anchors.fill: keyRect
+                        cornerRadius: keyRect.radius * 2
+                        cached: true
+                        glowRadius: 2
+                        spread: 0.2
+                        color: keypadRoot.dropShadowColor
+                        opacity: (Math.sin(2*((Math.PI / 2) * keypadRoot.swipeProgress + 1.5 * Math.PI)) + 1)
+                    }
+
                     Rectangle {
                         id: keyRect
                         anchors.centerIn: parent
@@ -265,18 +274,6 @@ Rectangle {
                         }
                     }
 
-                    DropShadow {
-                        anchors.fill: keyRect
-                        source: keyRect
-                        cached: true
-                        horizontalOffset: 0
-                        verticalOffset: 1
-                        radius: 4
-                        samples: 6
-                        color: keypadRoot.dropShadowColor
-                        opacity: (Math.sin(2*((Math.PI / 2) * keypadRoot.swipeProgress + 1.5 * Math.PI)) + 1)
-                    }
-
                     PlasmaComponents.Label {
                         visible: modelData !== "R" && modelData !== "E"
                         text: modelData

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

@@ -31,6 +31,16 @@ Item {
     
     opacity: 1 - Math.min(1, 1.5 * Math.abs(rect.x) / width) // opacity during dismiss swipe
 
+    RectangularGlow {
+        anchors.topMargin: 1
+        anchors.leftMargin: 1
+        anchors.fill: rect
+        cornerRadius: rect.radius * 2
+        glowRadius: 2
+        spread: 0.2
+        color: "#616161"
+    }
+    
     // notification
     Rectangle {
         id: rect
@@ -202,14 +212,4 @@ Item {
             }
         }
     }
-    
-    DropShadow {
-        anchors.fill: rect
-        source: rect
-        horizontalOffset: 1
-        verticalOffset: 1
-        radius: 4
-        samples: 6
-        color: "#616161"
-    }
 }