A symbol built after opening (lazy folios) links to the partners its
link rows name, and to the symbols whose rows name it; its file's list
only adds what the rows miss. The rows keep a partner on a folio not
built until it is built, in its saved place, so a symbol no longer keeps
a list of its own: the list read from the file is dropped once opening
has filled the database. pendingLinks(), waitingLinks(),
keepsSavedLinks(), linksToSave() and QETProject::waitingLinkTargets()
go; the callers that asked a symbol for its waiting partners ask the
database (waitingPartners()).
When its links change, a symbol's rows are written from its built
partners and the waiting partners its rows held, in their order
(rowsToWrite()), so a full rewrite of the table keeps them too.
A symbol built alone as a partner on a folio not built
(Diagram::buildSymbols()) counts as built: its rows are kept, it is not
waiting (waitingSymbols(), waitingPartners()), so saving does not build
its folio, and removing it does not remove the rows naming it. A row
naming a placed symbol that has not linked yet (its folio being built)
is kept too. At opening the database holds no link until its fill
(forgetLinks()); the symbols read their files' lists until then, and the
fill takes their order: a symbol's own rows, its list, then the rows
naming it. The symbols waiting on folios not built are cached and
updated as folios are built.
QET_CHECK_LINK_ROWS now checks the rows against the links: each built
partner in its order, no other row but to a folio not built.
tst_resaveunchanged::undoKeepsLinksToUnbuiltFolios: m_000 opened with
lazy folios, a contact, its folio or its coil's folio (not built)
removed, then undone: every link saved as before.
QETZ-DB-FIRST stage 2a-3.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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