Cross-references were missing from DXF exports, as reported on the
forum: https://qelectrotech.org/forum/viewtopic.php?id=2481
generateDxf() walks the scene and collects items by cast. A slave
element's cross-reference label ("(6-G15)", pointing back to its master)
is a plain QGraphicsTextItem hung off a DynamicElementTextItem as a
child, so it matches neither the IndependentTextItem nor the
DynamicElementTextItem branch and was dropped on the floor. Nothing was
wrong with the label itself; it was simply never collected.
Collect it through the existing DynamicElementTextItem::slaveXrefItem()
accessor and draw it with the same placement, rotation and multi-line
handling as the other text items, using defaultTextColor() since a bare
QGraphicsTextItem has no DiagramTextItem::color().
Measured on examples/industrial.qet, comparing against the PDF export
(which renders the whole scene and so shows everything):
before after PDF
slave xrefs "(n-Xn)" 0 41 41
folio/position strings 317 358 403
The slave cross-references now match the PDF exactly.
Still missing, and not addressed here: the master-side cross-reference
table drawn by CrossRefItem, which accounts for the remaining 45
strings. CrossRefItem is a QGraphicsObject that renders itself with
custom QPainter code in three different modes (drawAsCross,
drawAsContacts, drawAsPlcTable) including contact symbols and rules, so
giving it a DXF representation is a larger piece of work than this.
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