duan_jandClaude Fable 5
26fbe2ca42
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Root cause of the long-standing cross-test SystemError flake
("QPushButton returned NULL", CI failing test_title_label after an
unrelated file): TitleLabel schedules
QTimer.singleShot(0, self._apply_collapsed) at construction; when the
banner is deleted before the event loop spins (what every panel test
does), the pending timer fires into the dead C++ object and poisons
whatever test runs next. Deterministic repro added as a regression
test. The receiver-context overload singleShot(0, self, ...) auto-
cancels the callback when the widget dies. Same fix for the two
deferred main-window callbacks (dock split, floating-dock enlarge).
Note for the record: the LOCAL segfault storm this afternoon was the
dev machine's disk hitting 100% full (uv cache at 15G) — Bus errors
from mmap on a full disk, unrelated to any code.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>