A plug-in of the wrong kind now gets "is a plug-in of kind `exporter`, not an importer", with rows in every complete-message catalog. The importer failure test also covers an open, edited document. docs/plugins.md states that Open Recent does not remember Open With's importer or parameters.
An importer may declare an extension that File › Open handles another
way: a plug-in, shortcut set, script, preset, library or swatch library
such as .ase, or one a built-in format reads. "All readable files" and
the importer's own filter no longer list those extensions, and an
importer with none left gets no filter. Open With still opens them.
New from Template, Load Character/Paragraph/All Styles, Recolor's Other
Library… and the library panels' Other Library… read files with the
built-in readers, so their open dialogs now use builtin_open_filters(),
which leaves out the extensions only importer plug-ins read. File › Open
keeps open_filters() with the importers' files.
The artboard of a document an importer opens is now kept within
±4,000,000 pt. Art at the edge (a zero-width path at x = 4,000,000, or a
stroke past the edge) gave an artboard beyond it, and every later edit
of the document was rejected.
An importer plug-in (kind "importer", permission import.read) lists 1 to 8
file extensions and turns a file's bytes into objects, which open as a new
document whose artboard is their bounds. File › Open lists its extensions,
File › Open With (file.openWith) opens a file with a chosen importer, and
document.open takes importer and params. A built-in format that reads the
file by its content or extension always opens it; among importers listing
the same extension, the one whose id sorts first opens it. An importer reads
at most 128 MiB, and Place still reads only the built-in formats.
Docs: docs/plugins.md, docs/mcp.md, docs/gaps.md, docs/target-app-parity.md.
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