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Here was seweral bugs and memoryleaks, so I fix that. Most serious bug - with boundingRect on NodeGraphicsObject and ConnectionGraphicsObject. If you change location of some node, and set new connection from it (for example) you can gеt error - usage pure virtual method. I set geometry classes as freands of graphics classes and fix that. Also here was bug with resizing of node - I change sequance of methods and now position of proxywidget set AFTER recalculate of size.