Export to PDF could end in complete silence: the flow hands off to an
async rfd save dialog, and when that future resolves to None the app
mapped it straight to Task::none(). None does not only mean the user
cancelled — on Linux the XDG portal SaveFile call can fail outright
(rfd then tries a zenity fallback, which may not be installed) and the
future still just resolves to None. rfd reports those failures only
through the `log` crate, and logging is opt-in (--log / RUST_LOG), so
the reporter saw exactly what #369 describes: no dialog, no error, no
console output, no file.
- EXPORT / EXPORTPDF now accept an optional path argument that exports
straight to the file with no dialog — both the workaround for systems
where the native save dialog cannot open and a headless-testable
entry point. A relative path lands next to the drawing; a missing
extension gets .pdf.
- The dialog-None arms (PlotExportPath / PlotWindowExportPath) now push
a command-line message pointing at EXPORTPDF <path> instead of doing
nothing.
- The success message prints the full output path, not just the file
name, so users can find the PDF.
Verified end to end on the real binary via --serve: LINE + CIRCLE then
EXPORTPDF <path> writes a valid PDF with the expected geometry. Both
new tests fail on the previous code.
Fixes#369
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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