Disallow navigation to a BetweenBaseAndScripts position when base is placeholder #101
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Closed: #99
I start to think that it will be useful to take out some checks into separate functions and reuse them as needed.
Also, I had thought the bug ("Exeption: Nuclear fusion is not supported if there are neither subscripts nor superscripts in the current atom") that random test is discovered was related to this issue. But, no, it's something different.