Files
qelectrotech-source-mirror/sources
ispyisail 3af551583c Write default XRef properties in a stable order
QETProject::toXml() iterated defaultXRefProperties().keys() straight into
the document. That is a QHash, and Qt randomises hash iteration order per
process, so every save wrote the <xref> children in a different sequence.

Saving an unchanged project therefore produced a different file each
time. The content was identical -- same size, same elements -- but the
order moved, so version control showed spurious changes on every save and
comparing two saved files showed differences that were not there.

Sorting the keys before writing makes a save reproducible. This is the
same class of problem, and the same fix, as the sort already applied to
Diagram::toXml()'s <elements> and <conductors> blocks.

Measured with tests/determinism (resave twice, compare):

  before: I1 idempotent save 0/23
  after:  I1 idempotent save 5/23

with ArduinoLCD, ShellyParts, convertisseur, schema_indus and
schema_unifilaire_voltaique2 newly reproducible, and no regressions
against the baseline.

Not the only remaining source of save instability -- the other 18
projects still fail I1 for other reasons. This fixes the hash-ordering
source only.

Note this is not a Qt6 regression. The Qt5 build happened to produce a
favourable hash order for four projects and Qt6 does not, but both were
writing an unspecified order; only the dice changed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-12 23:21:55 +12:00
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