[FEATURE REQUEST] Quota improvements from GraphAPI

[jesmrec]

That comes from #4401 (comment)

Some improvements we could add, taking advantage of GraphAPI:

• If quota is exceeded, currently we show No storage usage information available. I'd show the bar full instead. We can also take advantage of the state field that comes in the response:

 "quota": {
                "remaining": 0,
                "state": "exceeded",
                "total": 1000000000,
                "used": 1423007244
            },

playing with colors depending on the status is another option (normal, nearing, exceeded)

• Quota is updated in some scenarios, that we could spread to those ones in which the value changes locally:

  • Adding a new file
  • Deleting a new file
  • (Maybe all of these cases can be handled updating the quota in the synchronization/refresh operation)

They could trigger a new request to update the values

• Show spaces' quota as well

• Showing the quota in manage accounts dialog

• Checking if quota can be retrieved from other different endpoint, without fetching whole info about all spaces.

TASKS

• Research (if needed)
• Create branch feature/feature_name
• Development tasks
  • Implement whatever
  • ...
  • Implement unit tests (if needed)
• Code review and apply changes requested
• Design test plan
• QA
• Merge branch feature/feature_name into master

[jesmrec]

Put an eye on https://github.com/owncloud/enterprise/issues/5808

Could be another fix/improvement to do.