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Needs to go over the input twice in order to produce a stable result

GNU indent has issues with very long lines where something->gets->derefed->a->lot->and->even->more and will toggle back and forth between two indentation schemes for such long derefs across line ends.

In the old gst-indent we do this:

# Run twice. GNU indent isn't idempotent
# when run once
for i in 1 2; do
$INDENT \
  --braces-on-if-line \
  --case-brace-indentation0 \
  --case-indentation2 \
  --braces-after-struct-decl-line \
  --line-length80 \
  --no-tabs \
  --cuddle-else \
  --dont-line-up-parentheses \
  --continuation-indentation4 \
  --honour-newlines \
  --tab-size8 \
  --indent-level2 \
  --leave-preprocessor-space \
  $* || exit $?
done

Our gst-indent-1.0 tool needs to do this transparently (we could just point the script to gst-indent-1.0 but that wouldn't work well on Windows I think?)