Excessive revalidation during input focus events

[arnihermann]

I've noticed in my application that has multiple useSWR uses, sometimes when the user does something that triggers a focus event – which bubbles up to the window object – SWR revalidates everything that's currently mounted.

I really like that revalidateOnFocus gives us automatic syncing of data when switching between windows, but when a user action triggers a focus within the application, it feels like it's overfetching.

I looked through the code on https://github.com/vercel/swr/blob/master/src/utils/web-preset.ts#L36 and I wonder if this is intended behavior?