sync with mobilecomponents 462b2b4

- Fixes blank pages when keyboard shows up, the margin computation was
  wrong, and apparently we get bogus info about the keyboard geometry.

Signed-off-by: Sebastian Kügler <sebas@kde.org>

qt-mobile/qml/mobilecomponents/ApplicationWindow.qml

@@ -60,8 +60,7 @@ ApplicationWindow {
         id: __pageStack
         anchors {
             fill: parent
-            bottomMargin: Qt.inputMethod.visible ? (root.y + root.height) - (Qt.
-inputMethod.keyboardRectangle.y) : 0
+            bottomMargin: Qt.inputMethod.visible ? Qt.inputMethod.keyboardRectangle.height : 0
         }
         focus: true
         Keys.onReleased: {