Snap-to values behave more like np.arange now.

emmyzero · emmyzero · commit db6adffdb09f · 2017-08-31T16:31:07.000-04:00
diff --git a/lib/matplotlib/widgets.py b/lib/matplotlib/widgets.py
@@ -373,7 +373,9 @@ def __init__(self, ax, label, valmin, valmax, valinit=0.5, valfmt='%1.2f',
     def _value_in_bounds(self, val):
         """ Makes sure self.val is with given bounds."""
         if self.valstep:
-            val = np.round(val/self.valstep)*self.valstep
+            val = np.round((val - self.valmin)/self.valstep)*self.valstep
+            val += self.valmin
+
         if val <= self.valmin:
             if not self.closedmin:
                 return
