QmlDesigner: Fix unintentional item reordering

Fix reordering of items in the Navigator if using shortcuts on a
SpinBox in the Property Editor.

Task-number: QDS-2738
Change-Id: Ia12d2d072c36fbb32156c9729cffd828e8747b28
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/StudioControls/RealSpinBoxInput.qml

@@ -128,6 +128,11 @@ TextInput {
         }
     }
 
+    // Ensure that we get Up and Down key press events first
+    Keys.onShortcutOverride: {
+        event.accepted = (event.key === Qt.Key_Up || event.key === Qt.Key_Down)
+    }
+
     TapHandler {
         id: tapHandler
         acceptedDevices: PointerDevice.Mouse