Error During Version Download Leaves UI in Bad State

[dsanders11]

A failed download will leave the action button in a bad state where you'll have to switch versions to recover. Also looks like it could happen in situations where you are offline, change versions, then come back online.

[codebytere]

Potentially related: on Windows, when switching versions fairly quickly, i keep seeing:

Failed to spawn Fiddle: EPERM: operation not permitted, unlink 'C:\Users\codebytere\AppData\Roaming\Electron Fiddle\electron-bin\current\electron.exe'

and then have to change versions again to get it to run

[dsanders11]

Potentially related: on Windows, when switching versions fairly quickly, i keep seeing:

Hm, that's probably tripping over Windows quirks, unfortunately. With the change to using @electron/fiddle-core there's a bottleneck on electron-bin\current since versions are unzipped on-demand to save disk space, and Windows can get finicky when you are touching files a bunch. We may be able to mitigate it by using graceful-fs in the right spots in @electron/fiddle-core (see graceful-fs code comment which explains some of the Windows quirks).

@codebytere, just to confirm, you're seeing that behavior on 0.32.9? I would have thought #1367 would help mitigate that by not doing the unzip until a run happens, making switching between versions not touch electron-bin\current, but maybe there's some edge case there still.