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30942e16dc
As reported on Gitter, running "echo İ" makes history autosuggestion
for "echo i" crash. This is because history search correctly
returns the former, but string_prefixes_string_case_insensitive("i",
"İ") incorrectly returns false. This is because the prefix check
is implemented by trimming the rhs to the length of the prefix and
checking if the result is equal to the prefix. This is wrong because
the prefix computation should operate on the canonical lowercase
version, because that's what history search uses.