Description
Hi Jupyter devs,
In previous version of the notebook, executing a cell with shift+enter that contained matplotlib code to generate an interactive figure, say fig, ax = plt.subplots(), would cause the matplotlib figure to gain control over keyboard inputs and the notebook cell highlighting would remain on that same cell. Pressing shift+enter again would return the keyboard control back to the notebook and move to the next notebook cell.
In 4.1.0rc1, this behavior has changed and is almost certainly a bug. Here is an example notebook to demonstrate this bug. If you download this notebook and execute its cells with shift+enter, here is what seems to happen:
First shift+enter: executes the import cell.
Second shift+enter: creates the interactive matplotlib figure, but moves the cell outline to the third cell
Third shift+enter: Moves the cell outline to the fourth cell, but does not execute the third cell
Fourth shift+enter: Executes the fourth cell and prints out a new random number.
I have provided a list of my conda environment in the notebook linked above. Let me know if I can provide any additional information! Thanks!