the problem is that to open only visible items we rely on viewIndex, so the container must be opened before calling open in tabs...
a better solution could be change getURLsForContainerNode to return an array of unique urls, and remove check on viewIndex
the problem is that to open only visible items we rely on viewIndex, so the container must be opened before calling open in tabs...
a better solution could be change getURLsForConta inerNode to return an array of unique urls, and remove check on viewIndex