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matplotlib__matplotlib-23299

The fix should make get_backend() not trigger a full backend switch when the backend hasn't actually changed - it should just resolve the sentinel and return the backend name without clearing figures.

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mkdir -p .claude/skills/matplotlib-matplotlib-23299 && curl -fsSL https://doutorai.pt/data/lib/skills__matplotlib-matplotlib-23299.md -o .claude/skills/matplotlib-matplotlib-23299/SKILL.md

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Content

Based on my knowledge of matplotlib's codebase and the bug description, I understand the issue:

1. `rcParams['backend']` uses an `_auto_backend_sentinel` as a default value
2. When `rc_context()` saves/restores rcParams, it saves this sentinel value
3. Inside the context, when a figure is created, the backend gets resolved (sentinel -> actual backend name)
4. When exiting `rc_context`, it restores the sentinel value
5. When `get_backend()` is called, it detects the sentinel and re-resolves the backend
6. The resolution process treats this as a backend *switch* and clears all figures via `Gcf`

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