Using with ecore tools

[zulus]

When I tryied open *.ecore or *.genmodel files I got this issue: `An error has occurred. See error log for more details. org.eclipse.swt.widgets.Tree cannot be cast to org.eclipse.ui.IEditorPart`` and in logs:

Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".

java.lang.ClassCastException: org.eclipse.swt.widgets.Tree cannot be cast to org.eclipse.ui.IEditorPart
    at io.emmet.eclipse.EclipseEmmetHelper.getTextEditor(EclipseEmmetHelper.java:53)
    at io.emmet.eclipse.TabKeyHandler.install(TabKeyHandler.java:44)
    at io.emmet.eclipse.TabKeyHandler$2.partActivated(TabKeyHandler.java:227)
    at org.eclipse.ui.internal.WorkbenchPage$14.run(WorkbenchPage.java:4790)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.WorkbenchPage.firePartActivated(WorkbenchPage.java:4788)
    at org.eclipse.ui.internal.WorkbenchPage.access$16(WorkbenchPage.java:4776)
    at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partActivated(WorkbenchPage.java:195)
    at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$2.run(PartServiceImpl.java:183)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartActivated(PartServiceImpl.java:181)
    at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:595)
    at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:539)
    at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:528)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3128)
    at org.eclipse.ui.internal.WorkbenchPage.access$21(WorkbenchPage.java:3042)
    at org.eclipse.ui.internal.WorkbenchPage$8.run(WorkbenchPage.java:3024)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3020)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2984)
    at org.eclipse.ui.actions.OpenWithMenu.openEditor(OpenWithMenu.java:338)
    at org.eclipse.ui.actions.OpenWithMenu$2.handleEvent(OpenWithMenu.java:180)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4166)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1466)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1489)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1474)
    at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1279)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4012)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3651)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
    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:354)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
    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:636)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1450)

System: OSX 10.8.4 Eclipse: 4.3RC4 (Kepler)

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[maxandersen]

Same as #26