Changing SafeText size can leave mess behind.

QSGNode *QQuickSafeText::updatePaintNode(...) is not implemented.

Example error as an attachment. How to produce:

1. create a SafeText item. Put few words of text in to it and make sure it all is shown.
2. decrease the item size in width so that last word is not shown (works at least when Wrap mode is word wrap)
3. the last word is partially shown outside the item's bounding box as in attached picture.