Checked the deployed fix in a real browser, since the earlier reply only syntax-checked it. Headless Chrome, two tabs on /compose/thread, a valid OpenPGP key in localStorage. Before the fix, typing 11 characters in tab A made tab B send 11 /api/get_profile requests. On the live build it sends none.
One smaller version of the same thing is still there. image_upload.js also re-runs the eligibility check on window focus and on visibilitychange, so the server gets a profile lookup every time you switch back to a ZenMemes tab with a composer open. That's per tab switch rather than per keystroke, but it's still a signal about when you're looking at the site. Throttling those re-checks to once a minute would fix it, and posting wouldn't be affected because the check before submitting calls refreshEligibility directly.
#meta #bug