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fix(save): replace files atomically

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Replace native engine saves and engine/MCP exports atomically, preserving private permissions during staging and cleaning up failed writes. Add regressions for long filenames and caught writer unwinding.

Fixes #436.

Co-authored-by: aiongg <aiongtaigi@gmail.com>
Co-authored-by: skylar taylor-barrick <hi@skylar.cc>
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aiongg
2026-10-12 09:19:36 -06:00
committed by GitHub
co-authored by aiongg skylar taylor-barrick
parent 3624f48819
commit 5cdcac4ace
13 changed files with 417 additions and 19 deletions
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docs/target-app-parity.md
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@@ -288,6 +288,7 @@ It is evidence of breadth: each item exists. It is not a claim of InDesign-level
- Missing fonts: highlighted pink on screen (never in output), listed by Preflight; Type › Find/Replace Font (fonts in the document, missing first; replace in text, cells, footnotes and styles); `font.list` / `font.replace`.
- Missing glyphs, as in InDesign: a character the applied font lacks is drawn as that font's missing-glyph box (its .notdef; a drawn box when the font's is empty), on screen and in PDF (as a path, so PDF/A and PDF/UA exports take it), and Preflight lists the characters by font. Preferences › Composition › Draw Missing Glyphs from Fallback Fonts (`document.preferences {glyphFallback}`, stored with the document) draws them from other fonts instead; it is off in new documents and IDML imports, on in documents saved before it existed. A missing font's substitute always uses fallback fonts.
- Damage-region repaint: after an edit the canvas re-renders only the frames whose composed text (or the items that) changed and patches its texture — pixel-identical to a full render; typing in a frame repaints in under a millisecond instead of a full-viewport render (22 ms measured on the sample).
- Native engine saves, Save a Copy, snippets, books, libraries, swatches and engine/MCP exports use same-folder atomic replacement. Failed writes before replacement retain the original; existing Unix permissions apply before staging document bytes. Desktop Services writes and CLI raster exports still need this routing. Parent-folder flushing is best effort, so this is not a power-loss durability guarantee.
- Crash recovery: unsaved documents are written to the recovery folder every 30 s and reopened (unsaved, remembering their files) after a crash; File › Revert and Save a Copy…; `file.recovery.*`, `file.revert`, `file.saveACopy`.
- Graphics backend chosen before the window exists (DirectX 12 on Windows, Vulkan on Linux, Metal on macOS, OpenGL as the fallback; `WGPU_BACKEND` overrides) with a start-up fallback: a backend whose start never showed a frame is skipped at the next start and the status bar says so (`gpu.json`). Found on an AMD hybrid-graphics laptop whose Vulkan driver faulted at the first present.
- Edit › Paste Into (copied objects become a frame's content, clipped by it; rendered, PDF and IDML both ways — verified in InDesign 2026); Polygon Settings (sides, star inset; double-click the Polygon tool).