local gmatch = string.gmatch
--[==[
Counts the number of lines in the input string, treating {"\n"}, {"\r"} and {"\r\n"} as new lines.]==]
return function(str)
local n = 1
for newline in gmatch(str, "([\n\r]\n?)[^\n\r]*") do
n = n + (newline == "\n\n" and 2 or 1)
end
return n
end
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