Merge pull request matplotlib#30619 from anntzer/step

Include step info in str(scroll_event).

Author: timhoffm

lib/matplotlib/backend_bases.py

@@ -1433,7 +1433,7 @@ def _from_ax_coords(cls, name, ax, xy, *args, **kwargs):
     def __str__(self):
         return (f"{self.name}: "
                 f"xy=({self.x}, {self.y}) xydata=({self.xdata}, {self.ydata}) "
-                f"button={self.button} dblclick={self.dblclick} "
+                f"button={self.button} dblclick={self.dblclick} step={self.step} "
                 f"inaxes={self.inaxes}")