Use the newline (etc.) escaped version of the commandline being executed in logging/debug output.

diffoscope/comparators/utils/command.py

@@ -33,9 +33,7 @@ class Command(metaclass=abc.ABCMeta):
         self._path = path
 
     def start(self):
-        logger.debug(
-            "Executing %s", ' '.join([shlex.quote(x) for x in self.cmdline()])
-        )
+        logger.debug("Executing %s", self.shell_cmdline())
 
         self._stdin = self.stdin()
         # "stdin" used to be a feeder but we didn't need the functionality so