cell focus/cursor issue when plotting to nbagg #6660

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Issue with matplotlib-1.5.1, anaconda on OS X.

This issue is related to #4758. I am trying to understand how cell focus works after having plotted to the nbagg backend.

Here is a simple example notebook: https://gist.github.com/croth1/ebfd2171559e8fd1799b600f3a72965a

shift+enter in the first cell executes as expected and moves the cell cursor to cell 2.
shift+enter in the second cell plots, grabs the focus of cell 2 and moves the cell cursor to cell 3.
another shift+enter releases the cell focus as described in #4758, but also moves the cell cursor to cell 4.
finally shit+enter executes the empty cell 4.

Somehow navigating through the notebook just by keyboard jumps over the plot in cell 3. Any idea's why that is?