Backport PR #17729: Fix type doc for scroll event "step" attribute.

QuLogic · meeseeksmachine · commit 0711bbc719f5 · 2020-06-23T21:26:16.000Z
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -1403,7 +1403,7 @@ class MouseEvent(LocationEvent):
            last change of keyboard state occurred while the canvas did not have
            focus, this attribute will be wrong.
 
-    step : int
+    step : float
         The number of scroll steps (positive for 'up', negative for 'down').
         This applies only to 'scroll_event' and defaults to 0 otherwise.
 
