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Merge pull request from Carreau/last-result Keep a reference to last execution result on the shell.

Craig Citro - - Load All Authors

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        Craig Citro
    
Make event triggering robust to (un)registration....

              r22317
            
      Update IPython event triggering to ensure callback registration and

      unregistration only affects the set of callbacks the *next* time that event is

      triggered. See :ghissue:`9447` and :ghpull:`9453`.

      This is a change to the existing semantics, wherein one callback registering a

      second callback when triggered for an event would previously be invoked for

      that same event.

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Craig Citro Make event triggering robust to (un)registration....	r22317	Update IPython event triggering to ensure callback registration and
		unregistration only affects the set of callbacks the next time that event is
		triggered. See :ghissue:`9447` and :ghpull:`9453`.

		This is a change to the existing semantics, wherein one callback registering a
		second callback when triggered for an event would previously be invoked for
		that same event.