Merge branch 'release/0.84.4' into develop
Unthrottle when going low on refresh queue.
Feed refresh: completely change strategy to avoid flooding the refresh queue. This should be much more reliable, and we have the throttler if anything goes wrong.
Make the throttle operation less frequent, now that feed refresh tasks should not overlap.
version bump for 0.84.5.
Merge branch 'release/0.84.5'