XLSheet.cpp - The bug remains, you need to add brackets and redefine "tabSelected"

[isajkin]

void setTabSelected(const XMLDocument& xmlDocument, bool selected)
{    // 2024-04-30: whitespace support
    unsigned int value       = (selected ? 1 : 0);
    XMLNode      sheetView   = xmlDocument.document_element().child("sheetViews").first_child_of_type(pugi::node_element);
    XMLAttribute tabSelected = sheetView.attribute("tabSelected");
    if (tabSelected.empty()) { //!!!!!
        sheetView.prepend_attribute("tabSelected");    // BUGFIX 2024-05-01: create tabSelected attribute if it does not exist
        tabSelected= sheetView.attribute("tabSelected");
    } //!!!!!
    tabSelected.set_value(value);
}

[aral-matrix]

Thank you very much @isajkin - that was an oversight in the original "bugfix" (that didn't fix the issue unless you called the function twice).
I have patched a fix into the master branch just now in commit e84a6dc