Allow tiny differences on screenshot comparison
Background
Occasionally filter tests fail when comparing screenshots that look identical, but actually have very small differences:
Since those differences can't be attributed to actual filter failures, but rather rendering issues outside the scope of the test, it would be desirable to allow current screenshot comparison some degree of fuzz.
What to change
Add fuzz to screenshot comparison. The fuzz value must be low enough for the comparison to still fail legitimate differences.
Edited by Toni Feliu