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QAbstractTableModel over query results, appended in batches so a large
query paints its first screenful immediately. Tag changes apply locally
for optimistic UI; reverting a failed write means calling applyTagChange
again with added and removed swapped, which the round-trip test pins.
Two additions to the drafted version:
- A ThreadIdRole, so a view's QModelIndex maps back to the thread id the
worker speaks without every caller reaching around the model.
- data() checks its own row and column bounds. Qt will not hand out an
out-of-range index and invalidates persistent ones on reset, so this is
unreachable defence rather than a live path; the test says so instead of
pretending to cover it.
Verified by mutation that the empty-batch guard, the ThreadIdRole, and the
full-row dataChanged range each fail exactly one test when removed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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