Bug 78317 Compare plug-in gets loaded by LocalHistoryActionGroup
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/compare/JavaCompareWithEditionAction.java
return;
		}
		
		boolean inEditor= beingEdited(file);
		if (inEditor)
			input= (IMember) getWorkingCopy(input);
		
		TextBuffer buffer= null;
		try {
			buffer= TextBuffer.acquire(file);
			ITypedElement target= new JavaTextBufferNode(buffer, inEditor);
			ITypedElement[] editions= buildEditions(target, file);
			ResourceBundle bundle= ResourceBundle.getBundle(BUNDLE_NAME);
			EditionSelectionDialog d= new EditionSelectionDialog(getShell(), bundle);
			d.setHelpContextId(IJavaHelpContextIds.COMPARE_ELEMENT_WITH_HISTORY_DIALOG);
			d.setCompareMode(true);
			Image image= JavaCompareUtilities.getImage(input);
			d.setEditionTitleImage(image);
			d.selectEdition(target, editions, input);
			if (image != null && !image.isDisposed())
				image.dispose();
		} catch(CoreException ex) {
			ExceptionHandler.handle(ex, getShell(), errorTitle, errorMessage);
		} finally {
			if (buffer != null)
				TextBuffer.release(buffer);
		}
	}
}