Large audiobook import => no UI feedback + "API" timeout in console (but eventually ... successful import)

[danielweck]

To reproduce, test with "Crimson Fairy Book LPF" (Lang_Crimson_Fairy_Book.lpf) from:

https://github.com/w3c/publ-tests/tree/master/test_content/audiobooks

...but remember to unzip, then re-zip the resources in order to fix the incorrect top folder. See: w3c/publ-tests#36

[danielweck]

Note that W3C *.lpf format is converted during import, so this certainly contributes largely to the processing time, but we must also check that importing Readium Web Pub Manifest *.audiobook files provides minimum UI feedback, and no API timeout.

[panaC]

what UI do you want ? A simple toastInfo when lpfConvert has finished and passes the relay to importPublication ?

[panaC]

what takes the most time is a double copy of the zip archive. We can flag it to user between them

[danielweck]

Note: this PR #930
adds a spinner indicator in the top-right corner during API background operations.

[panaC]

what do we do with this issue ? @danielweck @llemeurfr

[danielweck]

The console API timeout is only seen at development time, so I guess that's okay. The GUI progress indicator provides minimum feedback, so let's close this issue as it is not really actionable at this stage. We can always create a more narrow-focused issue later down the line, if long-running operations in Thorium remain problematic from a UX perspective.