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Discussion #604. Revives #643, closed on 2026-09-10 only to clear the
review backlog, ported onto current master.
The element editor shows an infinite grid, with nothing to judge how
big a symbol will look on a real folio. Affichage > "Afficher le cadre
de fond" draws a dashed blue rectangle centred on the element's origin
(the hotspot), sized by default to the drawing area of a default folio
(BorderProperties: columns x column width by rows x row height,
1020 x 640). Affichage > "Taille du cadre de fond..." sets another
size. Both persist in QSettings (elementeditor/background_frame_*).
The frame is drawn in ElementView::drawBackground(), so it is not part
of the scene: it is never written to the .elmt file and never in the
SVG export (scene render).
Changed from #643: resolved against master's new-style connects and
the hotspot visibility switch; the toggle gets the unused
document-print-frame theme icon (light and dark), without which it
showed as a text button in the icon toolbar; the size action is
registered with ShortcutManager like the toggle.
(cherry picked from commit a245411f9f)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>