upstream/ipython Commit - r19354:57b7ebaa

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* Added a widget persistence API. This allows you to persist your notebooks interactive widgets.

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* Added a widget persistence API. This allows you to persist your notebooks interactive widgets.

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Two levels of control are provided:

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Two levels of control are provided:

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1. Higher level- ``WidgetManager.set_state_callbacks`` allows you to register callbacks for loading and saving widget state. The callbacks are automatically called when necessary.

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1. Higher level- ``WidgetManager.set_state_callbacks`` allows you to register callbacks for loading and saving widget state. The callbacks you register are automatically called when necessary.

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2. Lower level- the ``WidgetManager`` Javascript class now has ``get_state`` and ``set_state`` methods that allow you to get and set the state of the widget runtime.

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2. Lower level- the ``WidgetManager`` Javascript class now has ``get_state`` and ``set_state`` methods that allow you to get and set the state of the widget runtime.

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Example code for persisting your widget state to session data:

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Example code for persisting your widget state to session data:

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             * Added a widget persistence API.  This allows you to persist your notebooks interactive widgets.
               Two levels of control are provided:
-. Higher level- ``WidgetManager.set_state_callbacks`` allows you to register callbacks for loading and saving widget state.  The callbacks are automatically called when necessary.
+. Higher level- ``WidgetManager.set_state_callbacks`` allows you to register callbacks for loading and saving widget state.  The callbacks you register are automatically called when necessary.
 . Lower level- the ``WidgetManager`` Javascript class now has ``get_state`` and ``set_state`` methods that allow you to get and set the state of the widget runtime.
               Example code for persisting your widget state to session data: