Fix NavigatorWindow not working if there is only one document #314
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See icsharpcode/ILSpy#2577.
The issue is that NavigatorWindow expects at least two documents and/or anchorables, otherwise it will not focus the listbox(es) correctly and further not allow the user to switch between documents/anchorables. The only way to exit the window is by using a mouse. However, some people may not be able to use a mouse or might use tools (e.g. Screen Readers, Voice Commands) that work solely by emulating key presses.