Uploading a file immediatly uploads the file even if the user cancels

[JulienParis]

When you upload a ressource on a dataset you are supposed to accept/confirm you want to upload the file, or cancel the upload...

But as the moment the user gets its file's preview, the file seems to be already uploaded to the dataset...

Detailed Description

some images to show the behaviour =>

1. upload your local file

2. preview of your local file

... notice that a 3rd line appeared inside the ressources list in the background

3. I clicked on cancel/annuler but the ressource is already loaded

[JulienParis]

... seems to be somehow linked to #2086 and/or #2357