use classList `add` instead of `toggle` on show
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@ -184,8 +184,8 @@ class Dropdown extends BaseComponent {
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this._element.focus()
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this._element.setAttribute('aria-expanded', true)
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this._menu.classList.toggle(CLASS_NAME_SHOW)
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this._element.classList.toggle(CLASS_NAME_SHOW)
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this._menu.classList.add(CLASS_NAME_SHOW)
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this._element.classList.add(CLASS_NAME_SHOW)
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EventHandler.trigger(this._element, EVENT_SHOWN, relatedTarget)
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}
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