Backport PR matplotlib#26184: FIX: AnnotationBbox extents before draw

Author: QuLogic

lib/matplotlib/offsetbox.py

@@ -1399,11 +1399,15 @@ def get_window_extent(self, renderer=None):
         # docstring inherited
         if renderer is None:
             renderer = self.figure._get_renderer()
+        self.update_positions(renderer)
         return Bbox.union([child.get_window_extent(renderer)
                            for child in self.get_children()])
 
     def get_tightbbox(self, renderer=None):
         # docstring inherited
+        if renderer is None:
+            renderer = self.figure._get_renderer()
+        self.update_positions(renderer)
         return Bbox.union([child.get_tightbbox(renderer)
                            for child in self.get_children()])
 

lib/matplotlib/tests/test_offsetbox.py

@@ -256,7 +256,8 @@ def test_anchoredtext_horizontal_alignment():
     ax.add_artist(text2)
 
 
-def test_annotationbbox_extents():
+@pytest.mark.parametrize("extent_kind", ["window_extent", "tightbbox"])
+def test_annotationbbox_extents(extent_kind):
     plt.rcParams.update(plt.rcParamsDefault)
     fig, ax = plt.subplots(figsize=(4, 3), dpi=100)
 
@@ -283,31 +284,22 @@ def test_annotationbbox_extents():
                          arrowprops=dict(arrowstyle="->"))
     ax.add_artist(ab6)
 
-    fig.canvas.draw()
-    renderer = fig.canvas.get_renderer()
-
     # Test Annotation
-    bb1w = an1.get_window_extent(renderer)
-    bb1e = an1.get_tightbbox(renderer)
+    bb1 = getattr(an1, f"get_{extent_kind}")()
 
     target1 = [332.9, 242.8, 467.0, 298.9]
-    assert_allclose(bb1w.extents, target1, atol=2)
-    assert_allclose(bb1e.extents, target1, atol=2)
+    assert_allclose(bb1.extents, target1, atol=2)
 
     # Test AnnotationBbox
-    bb3w = ab3.get_window_extent(renderer)
-    bb3e = ab3.get_tightbbox(renderer)
+    bb3 = getattr(ab3, f"get_{extent_kind}")()
 
     target3 = [-17.6, 129.0, 200.7, 167.9]
-    assert_allclose(bb3w.extents, target3, atol=2)
-    assert_allclose(bb3e.extents, target3, atol=2)
+    assert_allclose(bb3.extents, target3, atol=2)
 
-    bb6w = ab6.get_window_extent(renderer)
-    bb6e = ab6.get_tightbbox(renderer)
+    bb6 = getattr(ab6, f"get_{extent_kind}")()
 
     target6 = [180.0, -32.0, 230.0, 92.9]
-    assert_allclose(bb6w.extents, target6, atol=2)
-    assert_allclose(bb6e.extents, target6, atol=2)
+    assert_allclose(bb6.extents, target6, atol=2)
 
     # Test bbox_inches='tight'
     buf = io.BytesIO()