QmlDesigner.Puppet: Adding size hints to Window mockup

Without defining the properties, the properties do not work and
do not get notified properly. They are also missing defaults which
breaks "resetting".

Task-number: QTCREATORBUG-13004
Change-Id: Ib36f39770930be486225b45169d2ebdb53df8df4
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

share/qtcreator/qml/qmlpuppet/mockfiles/Window.qml

@@ -13,6 +13,12 @@ Rectangle {
     onStatusBarChanged: { if (statusBar) { statusBar.parent = statusBarArea } }
     onToolBarChanged: { if (toolBar) { toolBar.parent = toolBarArea } }
 
+    property int maximumWidth: 0
+    property int minimumWidth: 0
+
+    property int maximumHeight: 0
+    property int minimumHeight: 0
+
     Item {
         id: contentArea
         anchors.top: toolBarArea.bottom