Assign node to applicator before reapply can happen

src/travertino/node.py

@@ -44,12 +44,12 @@ def applicator(self):
 
     @applicator.setter
     def applicator(self, applicator):
-        self._applicator = applicator
-        self.style._applicator = applicator
-
         if applicator:
             applicator.node = self
 
+        self._applicator = applicator
+        self.style._applicator = applicator
+
     @property
     def root(self):
         """The root of the tree containing this node.

tests/test_node.py

@@ -1,4 +1,5 @@
 from unittest.mock import Mock
+from warnings import catch_warnings
 
 import pytest
 
@@ -43,6 +44,17 @@ def layout(self, root, viewport):
         root.layout.content_height = viewport.height * 2
 
 
+class AttributeTestStyle(BaseStyle):
+    class IntrinsicSize(BaseIntrinsicSize):
+        pass
+
+    class Box(BaseBox):
+        pass
+
+    def reapply(self):
+        assert self._applicator.node.style is self
+
+
 def test_create_leaf():
     """A leaf can be created"""
     style = Style()
@@ -371,3 +383,11 @@ def test_apply_before_node_is_ready():
 
     with pytest.warns(RuntimeWarning):
         Node(style=style, applicator=applicator)
+
+
+def test_applicator_has_node_reference():
+    # At the point that the style tries to apply itself, the applicator should already
+    # have a reference to its node.
+
+    with catch_warnings(action="error", category=RuntimeWarning):
+        Node(style=AttributeTestStyle(), applicator=Mock())