Bug#1051205: git grep -F isn't ‒ '(' fails with "fatal: unmatched parenthesis"

[наб]

Control: tags -1 + upstream

hehe hoho git grep '(' is actually git grep PATTERN_GROUP_START,
because git grep has pattern grouping.

Not a bug per se, but the error message is actively adversarial:
  $ git grep \(
  fatal: unmatched parenthesis
  $ git grep \)
  fatal: incomplete pattern expression: )
neither of these explain what the error actually is.
Somehow the one for ) is worse,
since this is a /complete/ pattern (which is a regular expression).

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