First stab at smoothing associationwidget endpoint update as announced
in https://bugs.kde.org/show_bug.cgi?id=447866#c5 umbrello/umlwidgets/associationwidget.{h,cpp} - At function calculateEndingPoints add argument UMLWidget *pWidget indicating the selected widget of move or resize. If passed in as null then updateAssociations() will be called twice, once for the current associationwidget's role A widget and again for its role B widget. - Add function findIntercept(const QRectF& rect, const QPointF& point, QPointF& result) returning bool true if the line from the center of `rect' to `point' intersects with one of rect's sides, and returning the intersection point in `result'. - Remove functions updateRegionLineCount and doUpdates. - Declare function updateAssociations `static' and change arguments to UMLWidget *pWidget, AssociationWidgetList list. For details see documentation at the implementation. CCBUG: 447866