Per https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(proposals)/Archive_133#RFC%253A_should_galleries_use_mode.3Dpacked_by_default.3F there's clearly overwhelming support for this (with a few holdouts). It's time to finally make the new code the default, and then fix any issues.
|operations/mediawiki-config : master||Change default gallery mode to 'packed' on the English Wikipedia|
Sorry for forgetting about this.
This change is now live on the Beta Cluster version of the English Wikipedia. See https://en.wikipedia.beta.wmflabs.org/wiki/Lion#Reproduction_and_life_cycle for an un-typed gallery that's now using mode=packed rather than mode=traditional, for instance.
If this is OK, please confirm, and then we can move ahead with deploying to production.
This is still lingering in beta configs. If it's a dead issue, I'd rather revert the beta changes than keep things out of sync for another 2 years. I don't see the difference in rendering, btw.