Ortho and the running object-snap set were app-global (settings.txt only) and
Isolate/Hide was a session-only view state, so none survived save/reopen and
none were per-drawing. Bind all three to the file like AutoCAD:
- Ortho -> header.ortho_mode ($ORTHOMODE); running OSNAP <-> header
.object_snap_mode ($OSMODE bitmask) via a new SnapType<->bit map in settings
(osmode_from_snaps / snaps_from_osmode, round-trip tested). The header is the
per-drawing store, live state mirrors the active drawing: adopt header->live
on open and tab-switch, stamp live->header on save and when leaving a tab, a
fresh drawing inherits the current values, and SETVAR ORTHOMODE/OSMODE now
also update the live state. settings.txt stays as the boot/new-drawing
default; the per-file header overrides it on open.
- Isolate/Hide now set each entity's persisted invisible flag (DXF code 60,
which acadrust round-trips in DXF and DWG) in addition to the session set;
End Isolation clears it. The set is reseeded from invisible entities on load
and after undo/redo, the commands are undoable and mark the tab dirty. The
renderer already skipped invisible entities, so no render change was needed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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