What's new in CubicWeb 3.21?
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Code movement
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The cubicweb.web.views.timeline module (providing the timeline-json, timeline
and static-timeline views) has moved to a standalone cube_

.. _cube: https://www.cubicweb.org/project/cubicweb-timeline

Deprecated code drops
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* the user_callback api has been removed; people should use plain
  ajax functions instead