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55886e5e8a
Three new QUndoCommand subclasses (AddDiagramCommand, RemoveDiagramCommand, MoveDiagramCommand) pushed onto the project's existing (already project-scoped) undo stack, so folio structure edits are undoable alongside every item-level edit already on that stack. - QETProject::addDiagram()/detachDiagram() are the shared attach/detach primitives: they mutate the diagram list, connect/disconnect the two per-diagram signals set up at add time, and emit diagramAdded/ diagramRemoved. AddDiagramCommand and RemoveDiagramCommand call these (via friend access) for both redo and undo, so a removed diagram is parked rather than destroyed -- it's only actually deleted if the command itself falls out of undo history while still detached. - ProjectView reacts to diagramRemoved the same way it already reacted to diagramAdded (tearing down/rebuilding the tab), so both directions of both commands go through the same reactive path every other diagram listener (project database, cross-references, generic panel) already relies on. - MoveDiagramCommand wraps a new ProjectView::setDiagramPosition(), which performs the tab move and the project's diagramOrderChanged() list reorder synchronously in one step, instead of relying on the queued tabMoved connection (needed for interactive drag-and-drop) to catch up later -- avoiding a second, redundant reorder from that queued call. - Multi-folio delete and multi-folio move (QETDiagramEditor::removeDiagrams() and the moveDiagram*(QList<Diagram*>) batch slots) wrap their per-diagram loop in QUndoStack::beginMacro()/endMacro(), so a multi-select action is one undo step, matching current UX. - Softened the delete confirmation's "this change is irreversible" wording now that it no longer is. Verified headlessly (Xvfb + xdotool + scrot): add/undo/redo, delete/undo/ redo (single and multi-select, single undo step for the batch), and move/undo/redo all behave correctly against a 7-folio project.