bug#20871: 25.0.50; fill-single-char-nobreak-p does not recognize a single-letter word when it is preceded by an open paren

[Marcin Borkowski]

Hello,

today I found that fill-single-char-nobreak-p is just a bit too
simplistic.  When point is after e.g. the string " (a", it returns nil
instead of t.  I am not sure which characters should be added to the
regex, but at least the opening paren (and maybe bracket) should be
there, so I'd change the regex into [[:space:]][[(]*[[:alpha:]].  (Two
or more opening parens/brackets are unlikely, but when in doubt, I guess
it's better to return t than nil than the other way round.)

Best regards,

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