Commits on Jun 2, 2022

1. Move draw_if_interactive logic to new_figure_manager_given_figure. …

   Currently, Matplotlib only ever calls draw_if_interactive at the end of
   `plt.figure()` (and upon figure unpickling), i.e. this is a mechanism to
   further customize handling of newly generated figures.  (Prior to
   Matplotlib 1.5, draw_if_interactive was also called at the end of all
   pyplot functions to trigger a figure redraw, but this is now handled by
   the stale attribute.)
   
   In order to simplify the backend API ("what is the API that a backend
   module must/can provide", I am planning to deprecate (on Matplotlib's
   side) the ability for backends to provide a draw_if_interactive
   function (forcing them to always do `if interactive(): draw_idle()`).
   Instead, any relevant new-figure-customization logic can instead go
   into `new_figure_manager_given_figure`.  This PR implements this change
   for ipympl, and should be fully back-compatible all the way back to
   Matplotlib 1.5.  I would like to make these changes first on the side
   of the clients (i.e., the third-party backends), to catch any possible
   problems with the intended change on Matplotlib's side.

   

   anntzer committed Jun 2, 2022
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