The SYSTEMD_COLORS=true/1/yes no longer forced colors when stdout was not a TTY (e.g. piped), because the COLOR_TRUE bypass of the terminal_is_dumb() check was accidentally dropped. Restore the old behavior by guarding the TTY check with `m != COLOR_TRUE`, so an explicit boolean "true" value continues to unconditionally force color output regardless of whether stdout is a TTY or whether $NO_COLOR is set.
System and Service Manager
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