Change upload validation to avoid input error on form #1038
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Fixes #1025.
When using the
if: proc ...
validation, the default JavaScript validation isn't aware of the state change when you add a file (AFAIK). The approach here uses a custom validation, which will change the presentation slightly:This is a tiny fix. Might be nice to handle the client-side issue, but maybe that's better left for when we do the bigger move off turbolinks?