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Ensure post event callbacks are always called....

Ensure post event callbacks are always called. Also, provide the execution result object as an argument for both *pre* and *post* event callbacks in a backward compatible manner. Closes .

Fabio Niephaus - - Load All Authors

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        Fabio Niephaus
    
Ensure post event callbacks are always called....

              r23982
            
      The *post* event callbacks are now always called, even when the execution failed

      (for example because of a ``SyntaxError``).

      Additionally, the execution result object is now made available in both *pre*

      and *post* event callbacks in a backward compatible manner.

      * `Related GitHub issue <https://github.com/ipython/ipython/issues/10774>`__

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Fabio Niephaus Ensure post event callbacks are always called....	r23982	The post event callbacks are now always called, even when the execution failed
		(for example because of a ``SyntaxError``).
		Additionally, the execution result object is now made available in both pre
		and post event callbacks in a backward compatible manner.

		* `Related GitHub issue <https://github.com/ipython/ipython/issues/10774>`__