Github user ruffle1986 commented on the issue:
https://github.com/apache/metron/pull/1096
It has turned out that Angular's changed the way how it renders templates
by default in version 6. Earlier, it preserved whitespaces by default but in
version 6 the `preservedWhitespace` option is false by default when using the
aot (head of time) compiler. Actually, it's a good thing because it reduces the
size of the production bundle but during the regression test, we noticed a few
differences in the layout before and after the version upgrade. So since we've
been relying on whitespaces, we have to set `preserveWhitespace` true.
https://github.com/sardell/metron/pull/10
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