`VariableSizeGrid` does not respond to `columnWidth` prop changes

I have a need for VariableSizeGrid to update cell styles when I change the columnWidth function (there’s a chance this also affects rowHeight, but I have not explored that yet). Right now, the width remains the same despite props changing because of https://github.com/bvaughn/react-window/blob/d80bef25fe706d0c73fc801674c086f681811190/src/VariableSizeGrid.js#L484

I have a codesandbox demonstrating the issue here: https://codesandbox.io/s/sweet-ellis-0ot7p

So far, my workaround is to add a key to VariableSizeGrid and make the key change with the props that affect columnWidth to force an update.

[kyleshevlin]

A colleague and I have found another workaround that makes use of the resetAfter* methods. Here’s a sandbox with a solution for Grids: https://codesandbox.io/s/laughing-noyce-sigw9?file=/src/App.js

The gist is you track the props that will change the item’s size, and force a reset of the cache based on those props. You can put that into a hook that returns a ref, such as I have in the sandbox above.

I still think that it’s odd that I have to be responsible for forcing a cache update on something that seems like it should bust the cache by default. I’m not sure whether this issue should remain open based on the facts that:

• This is a deliberate design choice, and
• Clearly these resetAfter* methods are the intended work around

[jameskerr]

I’d think the cache should bust when the itemData prop changes.