closesmatplotlib#20001

Fixesmatplotlib#20516PGF's `random steps` decoration seems to be the most similar,but does not exactly match the behaviour described in matplotlib's docs.Therefore I repurposed the `randomness` argument as a seed to givecontrol on how the line looks afterwards.

Co-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>

Switch documented deprecations in mathtext by `__getattr__` deprecations

Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>

…_outputAPI: rename draw_no_output to draw_without_rendering

Make warning for no-handles legend more explicit.

Remove unused HostAxes._get_legend_handles.

Redirect to new 3rd party packages page

legend_handler_map cleanups.

Clean up some Event class docs.

- parse() already normalizes prop=None to prop=FontProperties().- We don't need to explicitly attach a canvas to a plain Figure() before  calling savefig() anymore; FigureCanvasBase is always attached and  handles the dispatching to the correct concrete canvas class.

According to the docs, this function was added in GTK 2.2, so probablywas only needed when we supported GTK2.It also no longer exists in GTK4.

Since these examples don't need to support the very oldest GTK3, I tookthe opportunity to rewrite them using the recommended Application-styledmodel.

The `Gtk.Window.destroy` doesn't work, but `.close` correctly triggersour cleanup.

ENH: Adding callbacks to Norms for update signals

BUG: Fix f_back is None handling

This make the navigation on the left behave better

Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>

This hard codes the contents of the top bar which gets us out of thetrap that we want to have a different top-level structure to our completedocumentation than we want to have in the nav bar.

This makes them play much nicer with the navigation on the left side.