Fix so dead ref never equate to being equal. Add __eq__ to py3 versio…

…n as well.

kivy/weakmethod.py

@@ -55,6 +55,15 @@ def is_dead(self):
             '''
             return self.proxy is not None and not bool(dir(self.proxy))
 
+        def __eq__(self, other):
+            try:
+                if type(self) is not type(other):
+                    return False
+                s = self()
+                return s is not None and s == other()
+            except:
+                return False
+
         def __repr__(self):
             return '<WeakMethod proxy={} method={} method_name={}>'.format(
                    self.proxy, self.method, self.method_name)
@@ -107,7 +116,10 @@ def is_dead(self):
 
         def __eq__(self, other):
             try:
-                return type(self) is type(other) and self() == other()
+                if type(self) is not type(other):
+                    return False
+                s = self()
+                return s is not None and s == other()
             except:
                 return False