No cancel-button in `AsyncFileDialog` on web

[emilk]

AsyncFileDialog::pick_file shows this:

It is not obvious that this dialog can be canceled by clicking OK

Ofc this would be best fixed by:

• open os file picker directly on pickfile in wasm #128

[wareya]

I think "It is not obvious that this dialog can be canceled by clicking OK" describes the situation a bit too positively. If you've already loaded a file into the chooser, but decided you don't want to open it after all, you're stuck. There's no way to unload it from the chooser. So a real cancel button is still needed. (I ran into this.)