Comparison method on WeightedStep causes problems on JDK1.7

I got the stack trace below out of my Eclipse running Java 7 and jbehave-eclipse. This was when pressing Ctrl+Space for completions in the JBehave editor. The attached commit fixes the comparison method in question and adds a test. [JDK 1.7 tightened up Collections.sort to complain more about comparison methods not adhering to their contract]

java.lang.IllegalArgumentException: Comparison method violates its
general contract!
    at java.util.ComparableTimSort.mergeHi(ComparableTimSort.java:835)
    at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:453)
    at
java.util.ComparableTimSort.mergeForceCollapse(ComparableTimSort.java:392)
    at java.util.ComparableTimSort.sort(ComparableTimSort.java:191)
    at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)
    at java.util.Arrays.sort(Arrays.java:472)
    at java.util.Collections.sort(Collections.java:155)
    at
org.technbolts.jbehave.eclipse.editors.story.completion.StepContentAssistProcessor.computeCompletionProposals(StepContentAssistProcessor.java:113)
    at
org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1830)
    at
org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:556)
    at
org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:553)
    at
org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:488)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at
org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:482)
    at
org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1656)
    at
org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java:930)
    at
org.eclipse.ui.texteditor.ContentAssistAction$1.run(ContentAssistAction.java:82)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at
org.eclipse.ui.texteditor.ContentAssistAction.run(ContentAssistAction.java:80)
    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
    at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:185)
    at
org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHandlerWrapper.java:109)
    at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
    at
org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
    at
org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
    at
org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:468)
    at
org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:786)
    at
org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:885)
    at
org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:567)
    at
org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:508)
    at
org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:123)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1531)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1257)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1282)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1267)
    at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1294)
    at org.eclipse.swt.widgets.Widget.gtk_key_press_event(Widget.java:730)
    at
org.eclipse.swt.widgets.Control.gtk_key_press_event(Control.java:3019)
    at
org.eclipse.swt.widgets.Composite.gtk_key_press_event(Composite.java:734)
    at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1743)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:5016)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4408)
    at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)
    at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:8422)
    at org.eclipse.swt.widgets.Display.eventProc(Display.java:1245)
    at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native
Method)
    at
org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2276)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3207)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
    at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
    at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)