look for mixed indentation in compound statements, which makes them hard
to read, and sometimes makes it look like a statement is associated with
a nearby if/for

Change-Id: Ic8429cee1f9a86d938097a4a8769a2bce97b3361
Reviewed-on: https://gerrit.libreoffice.org/63283
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>