hermes-agent/tests/agent/lsp
Teknium 19071529f6
fix(lsp): shift baseline diagnostics into post-edit coordinates (#25978)
Pre-existing diagnostics below an edit point used to surface as 'LSP
diagnostics introduced by this edit' whenever the edit deleted or
inserted lines.  The delta-filter key included the diagnostic's
range, so the same logical error reported at a different line in
the post-edit snapshot looked like a brand new diagnostic.

Concrete case: deleting 14 lines in cli.py caused Pyright errors at
lines 9873, 10590, 12413, 13004 (unrelated to the edit) to be
reported as introduced by it.

Fix: build a piecewise-linear line-shift map (via difflib's
SequenceMatcher) from pre and post content, and remap baseline
diagnostics into post-edit coordinates before the set-difference.
Diagnostics in deleted regions drop out cleanly; diagnostics below
the edit shift by the right amount; diagnostics above are untouched.
The strict (range-aware) equality key stays — so a genuinely new
instance of an identical error class at a different line still
surfaces as new.

Pieces:
- agent/lsp/range_shift.py — build_line_shift, shift_diagnostic_range,
  shift_baseline.  Pure functions, no LSP state.
- agent/lsp/manager.py — LSPService.get_diagnostics_sync gains an
  optional line_shift kwarg; baseline is shift_baseline'd before
  computing the seen-set.  _diag_key keeps the strict range key.
- tools/file_operations.py — write_file captures pre_content for any
  LSP-handled extension (not just LINTERS_INPROC) and passes pre/post
  to _maybe_lsp_diagnostics, which builds the shift map.
- New _lsp_handles_extension helper guards the pre_content read.

Trade-offs preserved:
- Genuinely new same-class errors at different lines still surface
  (content-only key would have swallowed them).
- Pre-existing errors at unshifted positions still get filtered
  (covered by the strict-key path with no shift).
- Best-effort: when pre_content can't be captured (file didn't
  exist, permissions), the unshifted comparison still catches
  most pre-existing errors; the edge case it misses is a new file
  with a non-empty baseline, which is structurally impossible.
2026-05-14 15:56:07 -07:00
..
__init__.py
_mock_lsp_server.py
test_backend_gate.py
test_broken_set.py
test_client_e2e.py
test_delta_key.py fix(lsp): shift baseline diagnostics into post-edit coordinates (#25978) 2026-05-14 15:56:07 -07:00
test_diagnostics_field.py
test_eventlog.py
test_install_and_lint_fixes.py fix(lsp): typescript SDK install + tsc-missing skip + shellcheck warning (#24630) 2026-05-12 17:02:35 -07:00
test_lifecycle.py
test_protocol.py
test_reporter.py
test_service.py fix(lsp): shift baseline diagnostics into post-edit coordinates (#25978) 2026-05-14 15:56:07 -07:00
test_workspace.py