Nyall Dawson 1653bb80ab Regenerate legend renderer tests using a bold font, and fix too
large number of tolerance pixels in tests

The previous reference images all used such a narrow reference font
that they required a very large pixel tolerance, which was letting
through real errors.

As a result disable the json opacity test, which was completely
broken ever since it was introduced. The test had a LARGER number
of tolerance pixels than the reference images had, and accordingly
was testing nothing at all. And the issue hasn't been fixed, so
the test was a false positive... Now the test is fixed but failing
and disabled, pending someone (else) fixing the underlying issue.
2020-05-05 16:15:12 +10:00
..