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Plug-ins: Open With runs an importer off the UI thread, and Cancel stops it

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File › Open With reads a picked file on the thread File › Open uses, with the importer and its parameters, so a slow importer does not freeze the window. A call that names path still gets document.open's result. Cancel in the progress window now raises a cancel token on that thread, which stops a running importer between two slices of its budget.
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dotCooCoo
2026-11-08 08:09:23 -08:00
parent edd6acd9c0
commit 2772a44efd
9 changed files with 133 additions and 14 deletions
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docs/plugins.md
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@@ -65,7 +65,9 @@ extensions that a built-in format reads, and those File › Open installs, impor
`.kys`, `.jsx`, presets, libraries and swatch or graphic style libraries such as `.ase`). File › Open does not give
those files to the importer, and Open With does. **File › Open With** lists the
installed importers by name (`file.openWith {"importer", "path"?, "params"?}`), and each opens a file picked among its
extensions with that importer (on the web, File › Open's picker opens instead) and adds it to Open Recent. An importer
extensions with that importer (on the web, File › Open's picker opens instead) and adds it to Open Recent. On the
desktop the importer runs off the UI thread, and a run that takes a while shows a progress window with Cancel, which
stops it. An importer
with parameters, given no `params`, asks for them in a dialog of the same kind once the file is picked, and its Open
button opens the file; File › Open runs an importer with its parameters' defaults. **File › Open** of a `.wasm` file installs
a plug-in too (on the web this is how plug-ins get in). A heavy filter asks before it is installed, and runs in the