Bug 16181 Tab key doesn't work in editor when 'Insert spaces for tabs' enabled
Using integration build 0515, pressing Tab in an editor window doesn't do anything when 'Insert spaces for tabs' is selected. The editor is marked as unsaved, but no spaces appear.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
fGenerateActionGroup= new GenerateActionGroup(this, ITextEditorActionConstants.GROUP_EDIT);
		ActionGroup rg= new RefactorActionGroup(this, ITextEditorActionConstants.GROUP_EDIT);
		
		fActionGroups.addGroup(rg);
		fActionGroups.addGroup(fGenerateActionGroup);
		
		
		fContextMenuGroup= new CompositeActionGroup(new ActionGroup[] {
			fGenerateActionGroup, 
			rg, 
			new LocalHistoryActionGroup(this, ITextEditorActionConstants.GROUP_EDIT)});
	}
	/*
	 * @see JavaEditor#getElementAt(int)
	 */
	protected IJavaElement getElementAt(int offset) {
		return getElementAt(offset, true);
	}
	
	/**
	 * Returns the most narrow element including the given offset.  If <code>reconcile</code>
	 * is <code>true</code> the editor's input element is reconciled in advance. If it is 
	 * <code>false</code> this method only returns a result if the editor's input element
	 * does not need to be reconciled.
	 * 
	 * @param offset the offset included by the retrieved element
	 * @param reconcile <code>true</code> if working copy should be reconciled
	 */
	protected IJavaElement getElementAt(int offset, boolean reconcile) {
		IWorkingCopyManager manager= JavaPlugin.getDefault().getWorkingCopyManager();