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Created attachment 286297 [details] Model to reproduce Reproduced with Sirius 6.5.0 and 6.3.2 I found a use case not managed by the vertical space tool. To reproduce the bug: - Import the attached project "vertical_space_tool" and open the "Sequence Diagram on My" representation. - Activate the Ruler (Properties view > Rulers & Grid > Show Ruler) - Try to use the extra vertical space tool on the Ruler: place your cursor on the vertical Ruler, hold the keyboard shortcut CTRL+SHIFT, then drag up or down. An exception appears: java.lang.NullPointerException at org.eclipse.sirius.diagram.ui.tools.internal.editor.SiriusBlankSpacesDragTracker.getCurrentPositionZoomed(SiriusBlankSpacesDragTracker.java:198) at org.eclipse.sirius.diagram.ui.tools.internal.editor.SiriusBlankSpacesDragTracker.getCurrentPosition(SiriusBlankSpacesDragTracker.java:228) at org.eclipse.sirius.diagram.ui.tools.internal.editor.SiriusBlankSpacesDragTracker.handleDragInProgress(SiriusBlankSpacesDragTracker.java:122) at org.eclipse.gef.tools.AbstractTool.mouseDrag(AbstractTool.java:1114) at org.eclipse.gef.tools.SelectionTool.mouseDrag(SelectionTool.java:538) at org.eclipse.gef.EditDomain.mouseDrag(EditDomain.java:259) at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseMoved(DomainEventDispatcher.java:363) at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseMove(LightweightSystem.java:543) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:216) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4213) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1037) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4030) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3630) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1158) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1047) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155) at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594) at org.eclipse.equinox.launcher.Main.run(Main.java:1447)
