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Qt 4.6 introduces many new features and improvements as well as bugfixes
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over the 4.5.x series. For more details, refer to the online documentation
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included in this distribution. The documentation is also available online:
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  http://doc.trolltech.com/4.6





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The Qt version 4.6 series is binary compatible with the 4.5.x series.





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Applications compiled for 4.5 will continue to run with 4.6.





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Some of the changes listed in this file include issue tracking numbers





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corresponding to tasks in the Task Tracker:





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  http://www.qtsoftware.com/developer/task-tracker





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Each of these identifiers can be entered in the task tracker to obtain more





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information about a particular change.





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*                           General                                        *





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*                          Library                                         *





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****************************************************************************





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    * [245219] Added QXmlQuery::setFocus(const QString &focus);





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*                      Platform Specific Changes                           *





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*                   Important Behavior Changes                             *





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 - The experimental Direct3D paint engine has been removed. The reason for





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   this is that Nokia focuses on OpenGL for desktop hardware accelerated





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   rendering.





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 - When mixing OpenGL and QPainter calls you need to first call syncState()





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   on the paint engine, for example "painter->paintEngine()->syncState()".





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   This is to ensure that the engine flushes any pending drawing and sets up





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   the GL modelview/projection matrices properly.





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 - Graphics View has undergone heavy optimization work, and as a result of





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   this work, the following behavior changes were introduced.





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   a) QStyleOptionGraphicsItem::exposedRect now contains the item's bounding





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      rectangle, and QStyleOptionGraphicsItem::matrix is uninitialized by





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      default. You can enable an exact exposed rectangle and a correct matrix





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      by enabling the flag QGraphicsItem::ItemUsesExtendedStyleOptions.





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   b) QStyleOptionGraphicsItem::levelOfDetails is obsoleted and its value is





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      always initialized to 1. Instead you can call





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      QStyleOptionGraphicsItem::levelOfDetailFromTransform(const QTransform &)





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      to determine the level of detail.





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   c) QGraphicsView no longer calls QGraphicsView::drawItems(), and in turn





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      QGraphicsScene::drawItems(), by default. You can get the old behavior





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      back by enabling QGraphicsView::IndirectPainting.





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   d) QGraphicsItem no longer calls itemChange() for position and





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      transformation changes. If you want to receive notifications for changes





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      to the item's position and transformation, you can set the flag





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      QGraphicsItem::ItemSendsGeometryChanges (which is enabled by default by





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      QGraphicsWidget and QGraphicsProxyWidget).