minor fix for diff

Author: Chilipp

psy_simple/plotters.py

@@ -238,9 +238,9 @@ def update(self, value):
 
     def diff(self, value):
         try:
-            return ~(
+            return not (
                 (np.shape(value) == np.shape(self.value))
-                & np.all(value == self.value)
+                and np.all(value == self.value)
             )
         except TypeError:
             return True
@@ -3817,6 +3817,8 @@ class DataGrid(Formatoption):
 
     name = "Grid of the data"
 
+    data_dependent = True
+
     @property
     def xcoord(self):
         """The x coordinate :class:`xarray.Variable`"""