Edit File - bootstrap-dropdown-ml-hack.js

(function($bs) {
    const CLASS_NAME = 'has-child-dropdown-show';
    $bs.Dropdown.prototype.toggle = function(_orginal) {
        return function() {
            document.querySelectorAll('.' + CLASS_NAME).forEach(function(e) {
                e.classList.remove(CLASS_NAME);
            });
            let dd = this._element.closest('.dropdown').parentNode.closest('.dropdown');
            for (; dd && dd !== document; dd = dd.parentNode.closest('.dropdown')) {
                dd.classList.add(CLASS_NAME);
            }
            return _orginal.call(this);
        }
    }($bs.Dropdown.prototype.toggle);

document.querySelectorAll('.dropdown').forEach(function(dd) {
        dd.addEventListener('hide.bs.dropdown', function(e) {
            if (this.classList.contains(CLASS_NAME)) {
                this.classList.remove(CLASS_NAME);
                e.preventDefault();
            }
            e.stopPropagation(); // do not need pop in multi level mode
        });
    });

// for hover
    document.querySelectorAll('.dropdown-hover, .dropdown-hover-all .dropdown').forEach(function(dd) {
        dd.addEventListener('mouseenter', function(e) {
            let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
            if (!toggle.classList.contains('show')) {
                $bs.Dropdown.getOrCreateInstance(toggle).toggle();
                dd.classList.add(CLASS_NAME);
                $bs.Dropdown.clearMenus();
            }
        });
        dd.addEventListener('mouseleave', function(e) {
            let toggle = e.target.querySelector(':scope>[data-bs-toggle="dropdown"]');
            if (toggle.classList.contains('show')) {
                $bs.Dropdown.getOrCreateInstance(toggle).toggle();
            }
        });
    });
})(bootstrap);

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