Allow multiple sites to be filtered on

Thibaultmol

I recently noticed that it doesn't seem to be possible to do a site: search but with multiple sites.

So for example, this doesn't work: dyson site:printables.com,thingiverse.com,makerworld.com

Workaround for this is using lenses... which works EXCEPT if you want to do image search, because you can't do lens searches via image searches either.

pixel

You can do something like dyson site:printables.com OR site:thingiverse.com OR site:makerworld.com instead, since doing commas within the site operator is not supported.

Perhaps we could support that in the future though, but right now it's just mainly passed through to the upstream sources so it's whatever they support.