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fix(fonts): unloading a plugin forgets its manifest fonts

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PluginManager.unload_plugin() and the failed-load cleanup only called
FontManager.forget_manager_fonts(), which drops usage data. The plugin's
manifest registrations stayed: plugin_fonts / plugin_font_catalogs, its
plugin_id::family entries in font_catalog, and cached font objects for them
-- so its fonts kept resolving after unload and a family a reinstalled
manifest dropped stayed registered. The deprecated unregister_plugin_fonts
did this cleanup but nothing called it; it was removed in #708.

Add FontManager.forget_plugin_fonts(plugin_id) and call it from both
paths alongside forget_manager_fonts (each guarded on its own, so a font
manager stub with only one still works). FontManager takes no locks, so
like forget_manager_fonts it uses atomic pops over snapshots. A reload
(unload + load) registers the manifest fonts again and they resolve.

Raised by CodeRabbit on #709.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-10-04 17:00:28 -04:00
co-authored by Claude Opus 5.5
parent a74b5a2f0f
commit 10ac608b9d
6 changed files with 207 additions and 12 deletions
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test/test_plugin_manager_failed_load_cleanup.py
+1
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@@ -69,6 +69,7 @@ def test_fixed_plugin_loads_new_code_after_failed_load(plugin_env, first_source)
assert MODULE_NAME not in sys.modules
assert PLUGIN_ID not in pm.plugin_loader._loaded_modules
pm.font_manager.forget_manager_fonts.assert_called_with(PLUGIN_ID)
pm.font_manager.forget_plugin_fonts.assert_called_with(PLUGIN_ID)
(plugin_dir / "manager.py").write_text(_FIXED, encoding="utf-8")
assert pm.load_plugin(PLUGIN_ID) is True