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581a35e568
This fixes a bug where using \A or (?-m)^ in combination with -U/--multiline would permit matches that aren't anchored to the beginning of the file. The underlying cause was an optimization that occurred when mmaps couldn't be used. Namely, ripgrep tries to still read the input incrementally if it knows the pattern can't match through a new line. But the detection logic was flawed, since it didn't account for line anchors. This commit fixes that. Fixes #1878, Fixes #1879