DeprecationWarning due to widgets/interaction.py's on_submit call

[collares]

Description

When running Sagemath tests after upgrading to ipywidgets 8.0.4, one of the tests emits the following deprecation warning:

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

The stack trace reveals that the offending on_submit call is coming from ipywidgets itself, at

ipywidgets/python/ipywidgets/ipywidgets/widgets/interaction.py

Line 211 in 9fd4c30

w.on_submit(self.update)

Relevant part of the stack trace:

      File "<doctest sage.interacts.library.?[0]>", line 1, in <module>
        interacts.calculus.riemann_sum()
      File "/nix/store/0yc2dwvpgvzj6mjp1495pz3bp2g7xrcd-python3-3.10.9-env/lib/python3.10/site-packages/sage/interacts/library.py", line 136, in library_wrapper
        interact(f, **widgets_constructed)
      File "/nix/store/0yc2dwvpgvzj6mjp1495pz3bp2g7xrcd-python3-3.10.9-env/lib/python3.10/site-packages/ipywidgets/widgets/interaction.py", line 510, in __call__
        w = self.widget(f)
      File "/nix/store/0yc2dwvpgvzj6mjp1495pz3bp2g7xrcd-python3-3.10.9-env/lib/python3.10/site-packages/ipywidgets/widgets/interaction.py", line 426, in widget
        return self.cls(f, self.opts, **self.kwargs)
      File "/nix/store/0yc2dwvpgvzj6mjp1495pz3bp2g7xrcd-python3-3.10.9-env/lib/python3.10/site-packages/sage/repl/ipython_kernel/interact.py", line 126, in __init__
        super().__init__(f, options, **kwds)
      File "/nix/store/0yc2dwvpgvzj6mjp1495pz3bp2g7xrcd-python3-3.10.9-env/lib/python3.10/site-packages/ipywidgets/widgets/interaction.py", line 211, in __init__
        w.on_submit(self.update)
      File "/nix/store/0yc2dwvpgvzj6mjp1495pz3bp2g7xrcd-python3-3.10.9-env/lib/python3.10/site-packages/ipywidgets/widgets/widget_string.py", line 145, in on_submit
        deprecation("on_submit is deprecated. Instead, set the .continuous_update attribute to False and observe the value changing with: mywidget.observe(callback, 'value').")
      File "/nix/store/0yc2dwvpgvzj6mjp1495pz3bp2g7xrcd-python3-3.10.9-env/lib/python3.10/site-packages/ipywidgets/widgets/utils.py", line 64, in deprecation
        warnings.warn(message, DeprecationWarning, stacklevel=stacklevel+1)
      File "/nix/store/abax98471z8fshv4b9p46bkh3lxmpy0z-python3-3.10.9/lib/python3.10/warnings.py", line 109, in _showwarnmsg
        sw(msg.message, msg.category, msg.filename, msg.lineno,
    :
    DeprecationWarning: on_submit is deprecated. Instead, set the .continuous_update attribute to False and observe the value changing with: mywidget.observe(callback, 'value').

[jasongrout]

Thanks for reporting this. Fixed over in #3670.