Loading JS once in the given cell

[jlstevens]

PR using the information now exposed in holoviz/pyviz_comms#87 to avoid repeatedly loading JS in the same cell (e.g. if multiple extensions are in the first cell of a notebook).

[philippjfr]

Does not seem sufficient, you'll also have to handle these lines:

    for r in [r for r in resources if r != 'holoviews']:
        Store.renderers[r].load_nb(inline=p.inline)
    Renderer.load_nb(inline=p.inline)

and we probably also need to think about adding warning checking that if same_cell_execution is true and 'plotly' not in panel.extension._loaded_extensions that the user has to make sure they run hv.extension('plotly') or pn.extension('plotly') first.

[codecov-commenter]

Codecov Report

Merging #5249 (86d62d0) into master (bf781e3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5249   +/-   ##
=======================================
  Coverage   86.75%   86.75%           
=======================================
  Files         298      298           
  Lines       62159    62162    +3     
=======================================
+ Hits        53926    53929    +3     
  Misses       8233     8233           

Impacted Files	Coverage Δ
holoviews/ipython/__init__.py	76.21% <100.00%> (+0.44%)	⬆️

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[maximlt]

I've merged master and the tests all passed 🎉 Ready to be merged then I think @jlstevens

[jlstevens]

Thanks for fixing the tests! @philippjfr please merge if you think this PR is ready.

[github-actions]

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