api.setFocusObject: when setting the navigator object, only set it to the actual...

api.setFocusObject: when setting the navigator object, only set it to the actual given NVDAObject if it has no tree interceptor, or the treeInterceptor is in passThrough or is transitioning. Else, use the root NVDAObject of the treeInterceptor. This makes sure that when moving around virtualBuffers wither with arrows, or quick nav, or tabbing etc, that the navigator object always remains on the actual document, and only the review cursor is at the position of the caret.