QmlDesigner: Reparent only on CTRL+SHIFT

Shift is a common modifier and we should use it
to limit changes to one axis (e.g. x), since this
is a useful and typical usage.

We moved reparenting to CTRL+SHIFT. It has issues
and can trigger crashes. Still it can useful
and it is unlikely to be triggered randomly/by accident
on this shortcut.

Task-number: QDS-7
Change-Id: Ieeac6323659d5bd95bd27a05b8e18808ecdf390b
Reviewed-by: Brook Cronin <brook.cronin@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/formeditor/movetool.cpp

@@ -107,6 +107,7 @@ void MoveTool::mouseMoveEvent(const QList<QGraphicsItem*> &itemList,
         FormEditorItem *containerItem = containerFormEditorItem(itemList, m_movingItems);
         if (containerItem && view()->currentState().isBaseState()) {
             if (containerItem != m_movingItems.constFirst()->parentItem()
+                    && event->modifiers().testFlag(Qt::ControlModifier)
                     && event->modifiers().testFlag(Qt::ShiftModifier)) {
 
                 const FormEditorItem *movingItem = m_movingItems.constFirst();