Fix Annotation arrow not updating after setting patchA

dikshajangra12918-oss · apple · commit a926a30a89e7 · 2026-04-14T22:57:39.000+05:30
Setting patchA on Annotation.arrow_patch has no visible effect because the arrow position is not recomputed.

This change ensures that the annotation is marked as stale when patchA changes, triggering proper recomputation during rendering.
diff --git a/lib/matplotlib/text.py b/lib/matplotlib/text.py
@@ -2199,8 +2199,14 @@ def update_positions(self, renderer):
                 xy=(bbox.x0 - pad / 2, bbox.y0 - pad / 2),
                 width=bbox.width + pad, height=bbox.height + pad,
                 transform=IdentityTransform(), clip_on=False)
+        old_patchA = self.arrow_patch.patchA    
         self.arrow_patch.set_patchA(patchA)
 
+        # Ensure arrow updates when patchA changes
+        if old_patchA is not patchA:
+            self.stale = True
+        
+
     @artist.allow_rasterization
     def draw(self, renderer):
         # docstring inherited
