npm run update-snapshot -- -u results in snapshot images diffs that aren't diff.

[davidlygagnon]

Just wanted to see if I was the only one getting this:

When I run npm run update-snapshot -- -u, I get a bunch of diffs on .pngs snapshot images. When looking at the diff, there does not seem to be any changes. I've been discarding them before committing but I feel we should probably fix this since it's a manual step I'd like to avoid doing over an over.

[davidlygagnon]

Example of diff that I get:

[interactivellama]

You are not. It's a big annoyance to me, too #1099 (comment)