Saving an unmodified project produced a different byte stream on
every run: QGraphicsScene::items() returns items in stacking order,
and ties between same-Z items follow the scene's internal index --
not any content-derived order -- so it isn't reproducible across
process runs. The legacy terminal-id table inherits the same
instability, since ids are assigned sequentially in element order.
Sort list_elements and list_conductors into a deterministic order
before serializing, using a key built from data that's actually
stable across loads (position), not Element::uuid()/Conductor::uuid():
for an item with no persisted uuid attribute, fromXml() invents a
fresh random one on every load, so sorting by uuid would still be
non-deterministic across process runs for any legacy file -- which
this corpus has plenty of.
Also fixes a second, related source of byte-level non-determinism
found while verifying the above: Conductor::toXml() unconditionally
wrote m_uuid back out, including the synthetic value fromXml() just
invented for a conductor with no uuid attribute in the file. Every
conductor in every example project checked has no persisted uuid at
all, so this alone meant no project with conductors could ever
resave identically, regardless of ordering. Conductor gets a
m_persist_uuid flag, false only when the uuid it's holding was
synthesized rather than loaded, so toXml() stops writing a value
that was never meant to be permanent.
Deliberately NOT applying the same uuid-persistence fix to Element:
element uuids are cross-referenced by other elements' <links_uuids>
blocks for master/slave/report linking (element.cpp, tmp_uuids_link,
matched by elmt->uuid() == stored uuid on load). Making an element's
own uuid non-persistent would silently break that match for any
linked element without one already -- a real regression, not a
theoretical one. Left as a smaller, separate residual: 1-6 elements
per project across the corpus (a few tenths of a percent) still get
a fresh uuid on each load, same class of bug, needs the link-aware
version of this fix instead of this one.
Verified against 8 example projects (the ones with conductors, plus
the two zero-conductor control cases from FINDINGS.md F002), 5
resaves each in isolated HOME/XDG environments:
- Element and conductor ORDER: 0 churning sections across the whole
corpus (previously the majority of diagrams in industrial.qet,
m_000.qet and tremie_vibrante.qet churned on every run).
- Conductor uuid VALUES: 0 churn (previously every conductor in
every project, since none have a persisted uuid).
- 6 of 8 projects are now byte-for-byte identical (md5) across all 5
runs. The remaining 2 (industrial.qet, m_000.qet) differ only in
the handful of element uuids covered by the known Element residual
above -- confirmed by checking those uuids specifically, not
inferred.
- Element/conductor counts before and after resave match exactly on
every project (no data loss from the sort).
Fixes#754.
ElementsPanelWidget::duplicateDiagram() round-trips the folio through XML
and then gives the copied *elements* fresh uuids, because element.uuid is
the primary key of the project database and a duplicate silently fails to
insert. Conductors now have the same problem and needed the same loop:
conductor.uuid is likewise a primary key, its insert is a plain INSERT
rather than INSERT OR IGNORE, and a failure only reaches qDebug(). Without
this, every wire on a duplicated folio is missing from the wiring list and
from the per-element wire count, with nothing shown to the user.
Verified against the real schema: inserting the same conductor uuid for a
second folio fails with "UNIQUE constraint failed: conductor.uuid", leaving
one row where two were expected.
Also harden the uuid read in Conductor::fromXml(). The default argument of
QDomElement::attribute() is evaluated whether or not the attribute exists,
so a uuid was minted for every conductor on every load and thrown away; and
the default only applies when the attribute is *absent*, so a present but
empty or malformed uuid="" parsed to a null QUuid rather than a fresh one --
and null uuids collide with each other exactly as duplicates do.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Slice 1 of discussion #503 (from-to wiring list built on projectDataBase).
Conductor is the one item type on a diagram without a stable identity
of its own -- Element and Diagram both have a uuid, Conductor didn't.
This is the prerequisite the wiring-list tables need: a conductor
table keyed by uuid, the same way the existing element table is keyed
by Element::uuid().
- Conductor gets a QUuid m_uuid, generated in the constructor, with
uuid()/newUuid() accessors mirroring Element's exact pattern.
- toXml()/fromXml() read/write a "uuid" attribute the same way
Element already does, including the same generate-on-missing
fallback (QUuid(e.attribute("uuid", QUuid::createUuid().toString())))
for projects saved before this change.
- PasteDiagramCommand::redo() calls newUuid() on every pasted
conductor (content.conductors(), all three categories), mirroring
the existing per-element newUuid() call right above it -- otherwise
copy-paste would duplicate a conductor's uuid.
Backward compatibility: Conductor::valideXml() doesn't require the
"uuid" attribute, so old files parse unchanged. Verified by opening a
genuinely pre-uuid project (examples/industrial.qet, 150 folios, 671
conductors, legacy integer terminal1/terminal2 references with no
uuid attribute at all) -- loads and renders correctly, gets uuids
assigned on load, and those uuids are stable across a second
load/save cycle (byte-identical uuid values). Verified paste
separately: copying a selection with conductors and pasting produces
distinct new uuids for every pasted conductor, none colliding with
the originals or each other.
clazy is a compiler plugin which allows clang to understand Qt
semantics. You get more than 50 Qt related compiler warnings, ranging
from unneeded memory allocations to misusage of API, including fix-its
for automatic refactoring.
https://invent.kde.org/sdk/clazy
Add a combo box in the tool bar of diagram editor
to quickly change the size of the graphics handler item.
The sarto commit :D
NOTE
only available for diagram editor, element editor will
come later.
ispyisail