vectorcraft_testkit::temp_dir returns a bare path, so every engine test
that wrote into one left the folder in the system temporary folder.
- testkit: TempDir, a test's own folder made through temp_dir (same
private creation and ownership checks) under a tag no other TempDir in
the process uses, removed with its contents when dropped, also when
the test panics.
- Engine unit and integration tests hold a TempDir for the whole test
instead of calling temp_dir: graph, fileio, compare, journal, library,
shortcut set, spelling, store, web export, cancel, containers, build,
color settings, command sweep, font folder, removed font, model-based
and the font search fuzz.
- The DCS and swatch library tests' own helpers and the PDF editing
tests' shared vc-pdfedit-<pid> folder use a TempDir per test too.
- The font and link file search, store, color settings and font folder
helpers no longer delete the private folder temp_dir checked and make
it again with default permissions.
When type had used a font, removing the font while the app ran left
it in the font menus, and the type kept drawing in it until the app
restarted. The font list is the loaded faces plus the scanned catalog,
and a scan replaced the catalog but kept every loaded face.
A scan now drops each loaded face whose file it did not catalog, with
the face's cached outlines. A family with no face left leaves the font
lists, and type set in it lays out in the fallback font and is
reported missing, as when a document opens without the font. When the
font is installed again, the next scan lists it and the type draws in
it again. Bundled fonts and fonts added as bytes have no file and
stay.
Docs: docs/mcp.md, docs/target-app-parity.md.
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