src/plotting.py: properly maximize window when using matplotlib Qt backend

[swesterfeld]

I recently updated my system (to Ubuntu 26.04) and src/plotting.py (imagewmark get -P all ...)

mng.resize (*mng.window.maxsize())

now produces

AttributeError: 'MainWindow' object has no attribute 'maxsize'

this is because matplotlib is using Qt backend

import matplotlib
print(matplotlib.get_backend())

qtagg

The PR fixes this by checking if Qt's showMaximized is present and use it if it is.

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Summary by CodeRabbit

• Bug Fixes
  • Improved matplotlib figure maximization across supported backends.
  • Qt-based windows continue to use native maximize behavior for more consistent display sizing.
  • Added reliable maximization support for wx-based windows.
  • Other supported backends retain their existing window-resizing fallback behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 3e33eb8f-6e4f-4508-b015-ed825bf7efaa

📥 Commits

Reviewing files that changed from the base of the PR and between 5e9316c and 87b9040.

📒 Files selected for processing (1)

• src/plotting.py

🚧 Files skipped from review as they are similar to previous changes (1)

• src/plotting.py

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📝 Walkthrough

Walkthrough

The plotting module adds a shared window-maximization helper. Fullscreen display and animation setup use it. wx managers call Maximize(True), Qt managers call showMaximized(), and other managers use maxsize() resizing.

Changes

Matplotlib window maximization

Layer / File(s)	Summary
Centralize window maximization and update callers src/plotting.py	Adds maximize_plt_window(). The fullscreen branch of show() and polyanimation() call the helper. wx, Qt, and other managers use their respective maximization paths.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 87b90

The backend-specific maximization update has no established new failure requiring changes before merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 40.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary change: proper window maximization for the Matplotlib Qt backend. It does not mention the additional WXAgg support, but the title need not cover every change.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch maximize-qt-window

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.