Measured 2026-09-22 by scripts/smoke_settings_com.py --build-dwt against the
running AutoCAD 2026 (25.1s), each on a scratch Documents.Add() document:
1. RPC_E_CALL_REJECTED (-2147418111) on Documents.Count straight after
Documents.Open, after Close(False) inside document_close, and in
_ensure_document_state: AutoCAD's own message filter refuses incoming
calls while it is still switching documents. pywin32 exposes no
CoRegisterMessageFilter, so _wait_out_rejected_call waits the window out
for read-only callables (0.25 s -> 1 s pauses, 20 s budget, inside
COM_CALL_TIMEOUT) at those sites and after Documents.Add/Open; any other
com_error is not retried.
2. layer_list raised "'IAcadLayer' object has no attribute 'Color'. Did you
mean: 'color'?": acax25enu.tlb spells IAcadEntity/IAcadLayer `color` and
`Lineweight`. Late-bound dispatch resolved .Color/.LineWeight
case-insensitively; with a makepy cache present (this machine's gen_py was
regenerated on 2026-09-17, and every object a method returns is then a
generated wrapper) the lookup is exact. All 17 sites now use the typelib
spelling, which works on both wrappers; the fakes model the measured names.
3. layer_state_restore raised "'IAcadObject' object has no attribute
'Count'": Dictionaries.Item and IAcadDictionary.Item are declared
IAcadObject* (the narrowing _com_unnarrow already handles for MLEADER
styles). The save path went through the typed Dictionaries.Add, so only
the reopen paths failed. Both now un-narrow; the fakes narrow like pywin32.
4. The Freeze put on layer 0 raises 'Invalid layer' whatever the value, even
False while thawed (color/Linetype/Lineweight/Plottable/LayerOn/Lock/
ActiveLayer all fine on it), so a state saved with 0 current restored with
two warnings and 0 unapplied. Freeze is written only when it changes the
layer.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd
