{,Range}Slider: Add release notes for valfmt arguments

doronbehar · QuLogic · doronbehar · commit b6d74413c81a · 2025-08-07T10:56:02.000+03:00
Co-authored-by: Elliott Sales de Andrade &lt;quantum.analyst@gmail.com&gt;
diff --git a/doc/users/next_whats_new/sliders_callable_valfmt.rst b/doc/users/next_whats_new/sliders_callable_valfmt.rst
@@ -0,0 +1,6 @@
+Callable *valfmt* for ``Slider`` and ``RangeSlider``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In addition to the existing %-format string, the *valfmt* parameter of
+`~.matplotlib.widgets.Slider` and `~.matplotlib.widgets.RangeSlider` now
+also accepts a callable of the form ``valfmt(val: float) -> str``.
