Address review: preserve original/active positions and fix test + lint

maf2310 · maf2310 · commit a5435b5a09a9 · 2026-03-25T00:26:59.000Z
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
@@ -4657,8 +4657,10 @@ def _make_twin_axes(self, *args, **kwargs):
         twin.set_zorder(self.zorder)
 
         self._twinned_axes.join(self, twin)
+
         if not self.get_in_layout():
-            twin.set_position(self.get_position()) 
+            twin._set_position(self.get_position(original=True), which="original")
+            twin._set_position(self.get_position(original=False), which="active")
 
         return twin
 
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -484,7 +484,7 @@ def test_twin_respects_position_after_set_position(twin):
     ax.set_position([0.2, 0.2, 0.5, 0.5])
     ax2 = getattr(ax, f"twin{twin}")()
 
-    assert_allclose(ax.bbox.bounds, ax2.bbox.bounds)
+    assert_allclose(ax.get_position().bounds, ax2.get_position().bounds)
 
 
 def test_inverted_cla():
