Merge pull request #211390 from collares/sage-matplotlib-3.6

diff --git a/src/sage/interacts/library.py b/src/sage/interacts/library.py

index 06d680109a..139b00bfd1 100644

--- a/src/sage/interacts/library.py

+++ b/src/sage/interacts/library.py

@@ -1434,6 +1434,8 @@ def riemann_sum(

     creates the mathlet::

         sage: interacts.calculus.riemann_sum()

+        ...

+        DeprecationWarning: on_submit is deprecated. Instead, set the .continuous_update attribute to False and observe the value changing with: mywidget.observe(callback, 'value').

         Manual interactive function <function riemann_sum at ...> with 9 widgets

           title: HTMLText(value='<h2>Riemann integral with random sampling</h2>')

           f: EvalText(value='x^2+1', description='$f(x)=$', layout=Layout(max_width='41em'))

diff --git a/src/sage_docbuild/ext/multidocs.py b/src/sage_docbuild/ext/multidocs.py

index f91c7753ca..edeb81ff2e 100644

--- a/src/sage_docbuild/ext/multidocs.py

+++ b/src/sage_docbuild/ext/multidocs.py

@@ -284,6 +284,16 @@ def init_subdoc(app):

         if not app.config.multidoc_first_pass:

             app.connect('env-updated', fetch_citation)

+            def fix_matplotlib_css_permissions(app: Sphinx, env):

+                css_file = os.path.join(app.builder.outdir, '_static', 'plot_directive.css')

+                try:

+                    os.chmod(css_file, 0o644)

+                except:

+                    pass

+

+            # executed after matplotlib's _copy_css_file

+            app.connect('build-finished', fix_matplotlib_css_permissions, priority=600)

+

         # Monkey patch copy_static_files to make a symlink to "../"

         def link_static_files():

             """

    # Parallelize docubuild using subprocesses, fixing an isolation issue. See

    # https://groups.google.com/forum/#!topic/sage-packaging/YGOm8tkADrE

    ./patches/sphinx-docbuild-subprocesses.patch

    # Docbuilding copies files from the Nix store and expects them to be writable.

    # Remove when https://github.com/matplotlib/matplotlib/pull/23805 lands.

    ./patches/sphinx-fix-matplotlib-css-perms.patch

  ];

  # Since sage unfortunately does not release bugfix releases, packagers must

    # conflicts. The patch below contains rebased versions.

    ./patches/pari-2.15.1-upgrade-rebased.patch

    # https://trac.sagemath.org/ticket/34668

    (fetchSageDiff {

      name = "matplotlib-3.6-upgrade.patch";

      base = "9.8.beta2";

      rev = "5501e0de0dca1cff0355326dd42bd8c7e5749568";

      sha256 = "sha256-ceJkVaecIsZewN8v/3gPQXFbFjv5Akz6zEFg/ToXdek=";

    })

    # https://trac.sagemath.org/ticket/34693

    (fetchSageDiff {

      name = "matplotlib-3.6-docbuilding.patch";

      base = "9.8.beta4";

      rev = "64589686c261d33e6b5aff2589bcae8af004bcc6";

      sha256 = "sha256-j5AMY1TmhP+HBBBYaFZSkABJ5vtwe6iP2LRfGEgSm8Q=";

    })

    # https://trac.sagemath.org/ticket/34615

    (fetchSageDiff {

      name = "sphinx-5.2-upgrade.patch";

      base = "9.8.beta1";

      rev = "8f8af65e54d3a9962cfab40f15dc23f4e955b43f";

      sha256 = "sha256-yhDdyxnXSSkqLcuOPBWSEBc26rk1Od3gLcWW8S2p8bY=";

    })

    # temporarily paper over https://github.com/jupyter-widgets/ipywidgets/issues/3669

    ./patches/ipywidgets-on_submit-deprecationwarning.patch

    # Sage uses mixed integer programs (MIPs) to find edge disjoint

    # spanning trees. For some reason, aarch64 glpk takes much longer

    # than x86_64 glpk to solve such MIPs. Since the MIP formulation