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Title: Fix #21409: Make twin axes inherit parent position by maf2310 · Pull Request #31353 · matplotlib/matplotlib · GitHub

Open Graph Title: Fix #21409: Make twin axes inherit parent position by maf2310 · Pull Request #31353 · matplotlib/matplotlib

X Title: Fix #21409: Make twin axes inherit parent position by maf2310 · Pull Request #31353 · matplotlib/matplotlib

Description: Closes #21409 PR summary When set_position() is called before twinx() or twiny(), the twin axes are created using the original subplot position instead of the current position of the parent axes. This causes the twin axes to be misaligned with the parent. This change ensures that the twin axes inherit the current position of the parent at creation time by calling: twin.set_position(self.get_position()) This is a minimal fix that avoids changing the subplot or layout model and instead enforces consistency at twin creation time. A regression test was added for both twinx() and twiny(). It checks that the parent and twin axes have matching bbox.bounds after calling set_position() before creating the twin. Minimum example import matplotlib.pyplot as plt fig, ax = plt.subplots() ax.set_position([0.2, 0.2, 0.5, 0.5]) ax2 = ax.twinx() plt.show() AI Disclosure AI assistance was used to help understand parts of the existing Matplotlib codebase during investigation. The final patch and tests were implemented and validated manually. PR checklist "closes #0000" is in the body of the PR description to link the related issue new and changed code is tested [N/A] Plotting related features are demonstrated in an example [N/A] New Features and API Changes are noted with a directive and release note [N/A] Documentation complies with general and docstring guidelines

Open Graph Description: Closes #21409 PR summary When set_position() is called before twinx() or twiny(), the twin axes are created using the original subplot position instead of the current position of the parent axes. T...

X Description: Closes #21409 PR summary When set_position() is called before twinx() or twiny(), the twin axes are created using the original subplot position instead of the current position of the parent axes. T...

Opengraph URL: https://github.com/matplotlib/matplotlib/pull/31353

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og:image:altCloses #21409 PR summary When set_position() is called before twinx() or twiny(), the twin axes are created using the original subplot position instead of the current position of the parent axes. T...
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d9ef7af Fix #21409: Make twin axes inherit parent position maf2310 Mar 23, 2026 https://github.com/matplotlib/matplotlib/pull/31353/commits/d9ef7af11bd65934de92a7cbbfdb8a7716c13b80
88d4ec5 Refine twin position fix to preserve layout participation maf2310 Mar 24, 2026 https://github.com/matplotlib/matplotlib/pull/31353/commits/88d4ec56449927e8acbc8925ca84f7bd12225952
a5435b5 Address review: preserve original/active positions and fix test + lint maf2310 Mar 25, 2026 https://github.com/matplotlib/matplotlib/pull/31353/commits/a5435b5a09a951b5d644090f502c7caa9cf92d03
ce749b4 Clarify manual-position twin sync in code comment maf2310 Mar 25, 2026 https://github.com/matplotlib/matplotlib/pull/31353/commits/ce749b465cb8b787b49e1f8a9b4031e51f89f318
5876d06 Add regression test for twinx top spine position maf2310 Mar 27, 2026 https://github.com/matplotlib/matplotlib/pull/31353/commits/5876d06ffed133aecae705d0fff4dae1f54251ef
e8df9e5 Add test to ensure twin axes remain aligned after tight_layout maf2310 Mar 29, 2026 https://github.com/matplotlib/matplotlib/pull/31353/commits/e8df9e59bd26a9f6c2d068b91430926b72358f2e
c2a343c Add tests for twin axes alignment with manual positioning_layout maf2310 Mar 30, 2026 https://github.com/matplotlib/matplotlib/pull/31353/commits/c2a343cfdd9a481b978aecfe8138b710aed6daf5
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