Adding ItemIsMovable flag to QGraphicsProxyWidget breaks its positioning

[tuli]

Observe this simple scene example which puts two buttons on the scene:



auto ww = new QGraphicsProxyWidget();
ww->setWidget(new QPushButton());
ww->setPos(900, 900);

auto ww2 = new QGraphicsProxyWidget();
ww2->setWidget(new QPushButton());
ww2->setPos(500, 500);

auto scene = new QGraphicsScene();
scene->addItem(ww);
scene->addItem(ww2);

auto view = new QGraphicsView();
view->resize(1000, 1000);
view->setScene(scene);
view->show();


Everything works fine, and the two buttons appear at the specified positions.

However, if we now add the itemismovable flag to them like so:



auto ww = new QGraphicsProxyWidget();
ww->setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
ww->setWidget(new QPushButton());
ww->setPos(900, 900);

auto ww2 = new QGraphicsProxyWidget();
ww2->setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
ww2->setWidget(new QPushButton());
ww2->setPos(500, 500);

...




the the initial position of the items breaks. They both put over each other at position (0,0). However, if I call ww->setPos(...) after the view is shown, then that works.


Any idea what might be causing this?






Environment:

Qt 5.7
VS2013U5
Windows7SP1

[wysota]

Seems like a bug.