visit_time_ranges() reuses a single "original_duration" variable for two
unrelated purposes: the DTSTART->DUE span and the CREATED->COMPLETED span.
When a VTODO carries all four properties (a completed task, which most
clients write with CREATED and COMPLETED), the second assignment clobbers
the first, and the DTSTART/DUE branch of the rfc4791-9.9 table then
reconstructs DUE as DTSTART + (COMPLETED - CREATED).
The elif chain already implements the RFC table correctly (DTSTART/DUE
take precedence over CREATED/COMPLETED), so the CREATED/COMPLETED value
is never wanted there. Keep it in its own variable.
Effect: such a VTODO is filtered against a bogus interval, both in
calendar-query REPORT and in item.find_time_range() (the enclosing range
cached for the storage prefilter), so completed tasks go missing from -
or wrongly appear in - client results.
Co-Authored-By: Claude <noreply@anthropic.com>
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