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One session holds several open documents. The active document stays in
the Session's own fields, so commands and the UI keep working on it; the
others are parked as DocState values and swapped in field by field
(std::mem::swap, no clones or relayout). Session and DocState are
destructured exhaustively, so a new field must be classified as per
document or shared before it builds.
- Session::documents, activate, add_document, close_document,
is_untouched_blank, with_document, find_open, is_open; DocInfo.
- Document ids come from a process-wide counter.
- file.new opens beside the open documents; file.open replaces an
untouched blank document, opens beside the others otherwise, and
activates a file that is already open ("alreadyOpen": true).
- file.closeDocument {id?, force?} closes a document without a window
(refuses unsaved changes unless forced); file.close is unchanged.
- view.switchWindows {id?} lists the open documents or activates one.
- Envelopes, Labels, Finish & Merge and New from Template open their
result as a new document; the main document stays open, with no undo
step for the command.
- Each document keeps its own recovery worker and copy; Read Aloud
readings name their document; with_document tags UI requests with the
document they came from.