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mintty on windows always uses pipes to connect stdout between processes and for the terminal output. The previous implementation always assumed that stdout connected to a pipe means that stdout is displayed on a mintty terminal. However, this detection breaks when using pipes to connect processes and for powershell which uses pipes when redirecting to a file. Now the pipe filename is queried and matched against the pattern used by msys / cygwin when connected to the terminal. In all other cases assume that a pipe is just a regular pipe.