if our symbols are a different size, they need to be inner centered

the unlock key becomes a rect that contains the svg item. a property
alias preserves the api

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

@@ -1,12 +1,21 @@
 import QtQuick 2.0
 import org.kde.plasma.core 2.0 as PlasmaCore
 
-PlasmaCore.SvgItem {
-    id: square
-    property int value: 0
+Rectangle {
     anchors.top: parent.top
-    width: parent.width/4
+    color: "#00000000"
+    property int value: 0
+    property alias elementId: glyph.elementId
+    width: parent.width / 4
     height: parent.height
 
-    svg: symbolsSvg
-}
+    PlasmaCore.SvgItem {
+        id: glyph
+        anchors.top: parent.top
+        anchors.horizontalCenter: parent.horizontalCenter
+        width: Math.min(parent.height, parent.width)
+        height: parent.height
+
+        svg: symbolsSvg
+    }
+}