This is similar to piping your output to grep, only
our patterns are much weaker (as of yet), you can see
the intermediate output, and you can also still tee the
whole (unfiltered) output to a file at the same time.
Previously, a child command like 'echo "foo; echo bar"' would
actually have invoked echo twice, because essentially the
quotation-marks got eated by our input parser. Not ideal.
Now that we guard via hSupportsANSI this is not
an exception that should occur. And if it occurs
we'd rather crash, as reading of stdin can be broken
after such an exception.
Lennart Spitzner