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While working on https://bugs.eclipse.org/bugs/show_bug.cgi?id=544834 we found out that new edges may not have the proper bendpoint coordinates To reproduce you will need to comment in org.eclipse.sirius.diagram.ui.tools.internal.routers.RectilinearEdgeUtil.computeRectilinearBendpointsSameSourceAndTarget(Rectangle, ConnectionNodeEditPart) the following lines if (sourceSide == PositionConstants.NONE) { sourceSide = PositionConstants.EAST; } Then you need to open the sample from https://bugs.eclipse.org/bugs/show_bug.cgi?id=544834, create a new edge with the same source and target, set its style to Rectilinear Style Routing (once I had an exception at the step but did not reproduce) and finally move a bendpoint or an edge. This should not throw the following exception multiple time as you move: java.lang.IndexOutOfBoundsException: Index: 3, Size: 1 at java.util.ArrayList.rangeCheck(ArrayList.java:653) at java.util.ArrayList.get(ArrayList.java:429) at org.eclipse.gmf.runtime.gef.ui.internal.editpolicies.ConnectionBendpointEditPolicy.getLineSeg(ConnectionBendpointEditPolicy.java:599) at org.eclipse.gmf.runtime.gef.ui.internal.editpolicies.ConnectionBendpointEditPolicy.showMoveLineSegFeedback(ConnectionBendpointEditPolicy.java:788) at org.eclipse.sirius.diagram.ui.graphical.edit.policies.TreeLayoutConnectionLineSegEditPolicy.showMoveLineSegFeedback(TreeLayoutConnectionLineSegEditPolicy.java:169) at org.eclipse.sirius.diagram.ui.graphical.edit.policies.TreeLayoutConnectionLineSegEditPolicy.showSourceFeedback(TreeLayoutConnectionLineSegEditPolicy.java:185) at org.eclipse.gef.editparts.AbstractEditPart.showSourceFeedback(AbstractEditPart.java:1093) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.showSourceFeedback(ConnectionEditPart.java:1664) at org.eclipse.gmf.runtime.gef.ui.internal.tools.SelectConnectionEditPartTracker.showSourceFeedback(SelectConnectionEditPartTracker.java:216) at org.eclipse.gmf.runtime.gef.ui.internal.tools.SelectConnectionEditPartTracker.handleDragInProgress(SelectConnectionEditPartTracker.java:144) at org.eclipse.sirius.diagram.ui.tools.internal.ui.SiriusSelectConnectionEditPartTracker.handleDragInProgress(SiriusSelectConnectionEditPartTracker.java:172) at org.eclipse.gef.tools.AbstractTool.mouseDrag(AbstractTool.java:1114) at org.eclipse.sirius.diagram.ui.tools.internal.ui.SiriusSelectConnectionEditPartTracker.mouseDrag(SiriusSelectConnectionEditPartTracker.java:149) at org.eclipse.gef.tools.SelectionTool.mouseDrag(SelectionTool.java:538)
