Merge pull request #3249 from peter-gerlagh-kyos/fix/help-mypy-with-layout-setter

Move the dash.layout.setter so that type checkers can find it easier

Author: T4rk1n

dash/dash.py

@@ -746,15 +746,6 @@ def _setup_plotlyjs(self):
     def layout(self):
         return self._layout
 
-    def _layout_value(self):
-        layout = self._layout() if self._layout_is_function else self._layout
-
-        # Add any extra components
-        if self._extra_components:
-            layout = html.Div(children=[layout] + self._extra_components)
-
-        return layout
-
     @layout.setter
     def layout(self, value):
         _validate.validate_layout_type(value)
@@ -773,6 +764,15 @@ def layout(self, value):
             _validate.validate_layout(value, layout_value)
             self.validation_layout = layout_value
 
+    def _layout_value(self):
+        layout = self._layout() if self._layout_is_function else self._layout
+
+        # Add any extra components
+        if self._extra_components:
+            layout = html.Div(children=[layout] + self._extra_components)
+
+        return layout
+
     @property
     def index_string(self):
         return self._index_string