Fix validate logic if min/max are changed

IPython/html/widgets/widget_float.py

@@ -78,6 +78,8 b' class _BoundedFloatRangeWidget(_FloatRangeWidget):'
         """Validate min <= low <= high <= max"""
         if name == "value":
             low, high = new
+        else:
+            low, high = self.value
             low = max(low, self.min)
             high = min(high, self.max)
             self.value = (min(low, high), max(low, high))

IPython/html/widgets/widget_int.py

@@ -77,6 +77,8 b' class _BoundedIntRangeWidget(_IntRangeWidget):'
         """Validate min <= low <= high <= max"""
         if name == "value":
             low, high = new
+        else:
+            low, high = self.value
             low = max(low, self.min)
             high = min(high, self.max)
             self.value = (min(low, high), max(low, high))