Method insertNode

src/controller.cpp:728–755

}

void RcxController::insertNode(uint64_t parentId, int offset, NodeKind kind, const QString& name) {
    Node n;
    n.kind     = kind;
    n.name     = name;
    n.parentId = parentId;

    if (offset < 0) {
        // Auto-place after last sibling with alignment
        int maxEnd = 0;
        auto siblings = m_doc->tree.childrenOf(parentId);
        for (int si : siblings) {
            auto& sn = m_doc->tree.nodes[si];
            int sz  = (sn.kind == NodeKind::Struct || sn.kind == NodeKind::Array)
                ? m_doc->tree.structSpan(sn.id) : sn.byteSize();
            int end = sn.offset + sz;
            if (end > maxEnd) maxEnd = end;
        }
        int align = alignmentFor(kind);
        n.offset = (maxEnd + align - 1) / align * align;
    } else {
        n.offset = offset;
    }

    // Reserve unique ID atomically before pushing command
    n.id = m_doc->tree.reserveId();

    m_doc->undoStack.push(new RcxCommand(this, cmd::Insert{n}));
}

void RcxController::removeNode(int nodeIdx) {
    if (nodeIdx < 0 || nodeIdx >= m_doc->tree.nodes.size()) return;