Export for Screens and the Asset Export panel's Export encoded and wrote
every file on the UI thread, so the window stopped responding until the
last file was written. For 50 artboards in PNG at 1x, 2x and 3x, PDF and
SVG (250 files, 47 MiB), the dialog's OK took a median of 43.8 s in a
release build on Windows.
With Enable Background Export on (Preferences › File Handling), OK now
checks the settings, remembers them and takes a snapshot of the
document, and the dialog closes. The thread that writes background
saves and exports then encodes the files and writes them into the
folder, or one ZIP in it, and the export progress dialog's Cancel stops
it before the next file. The same OK takes under 0.001 s, and the files
have the same names and bytes. With the preference off, without a
folder, on the web and over MCP and scripts (document.exportForScreens
and assets.export), the files are made at once with the same reply as
before.
Both commands report one progress step per file, so the progress dialog
shows "File 3 of 250" and MCP progress notifications count the files in
place of the encoders' artboards and pages.
Docs: docs/target-app-parity.md, docs/control-protocol.md, docs/mcp.md.
A filter plug-in gets 50 M instructions and a minute for each run.
Filters that order a plotter's paths, pack shapes or run a simulation
need minutes, and the app shouldn't freeze while they compute.
A filter's manifest may now ask for "budget": "heavy" (Budget): each run
gets HEAVY_FUEL (1 G instructions) and HEAVY_WALL_TIME_MS (300 s). Only a
filter may ask. plugin.install refuses such a filter without allowHeavy:
true, and plugin.inspect returns the entry a module would have without
installing it. Install Plug-in… and File › Open ask the user and install
on OK; the plug-in store keeps the answer, and folder loads skip heavy
filters with a note, since they ask nobody.
The app runs a heavy filter on a thread of its own (plugin_runs), not in
Background Save's queue, with the status bar and a progress window
(Cancel, Continue in Background) that it shares with Background Export
(export_progress::window). FilterRun splits plugin.run: prepared on the
session, run on any thread, its output handed in, and the next
plugin.run with the same params applies that output instead of running
the plug-in again, so the edit stays one guarded, journaled command. A
result whose document or plug-in changed meanwhile is dropped, and the
status bar says to run it again. A cancelled plug-in run is now
EngineError::Cancelled.
What a filter keeps with the document (#3720) goes with the run: it is
given _context.documentData when the run is prepared, and the
documentData of its output is applied with its objects, in the same undo
step, when the run is handed in (FilterRun::finish).
Tests: plugins/tests/abi.rs (100 M loop steps out of a light budget,
within a heavy one; folders skip heavy filters), manifest.rs, engine
tests_plugins.rs (consent, inspect, the store, hand-in, a handed-in
run's document data, cancel) and
ui-egui tests_plugin_runs.rs (installing asks, no Preview, a background
run as one undo step, a stale result kept out, the progress window).
CRAFT_UI_HEAVY_FILTER_WASM=<folder> writes a test filter to try in the
app. Its strings and messages have rows in each complete catalog
(COMPLETE_MESSAGES).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HhvnnnD5fTFupK8WWq35un
While an export runs in the background (Background Export), a dialog shows
what is being exported and how far it has got: artboard by artboard for a
raster export of several artboards, busy otherwise. Cancel (also Esc) stops
it and writes no file; Continue in Background leaves it to the status bar.
It opens after 0.4 s and never over another dialog.
Built on the shared vectorcraft_doc::cancel (#2546): fileio::progress::Progress
wraps its CancelToken and a progress sink, so a cancelled export stops
drawing and keeps no half-drawn pattern tile or effect raster.
- ui: background jobs carry their Progress; export_progress draws the
dialog; UI commands file.cancelExport and file.exportInBackground.
- i18n: the strings in every language with complete menus, Danish, Dutch
and Indonesian included; "{n} more exports waiting" is a plural (trn).
- docs: ui-parity, gaps (G12) and ROADMAP rows.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dt49z1ubK9x1bPq51APgz3
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