cleanup listener

docs/resources/changelog.md

@@ -8,6 +8,7 @@ _During the beta period, these restrictions may be relaxed in the event of a mis
 
 ## Next
 
+- Fixed a bug in `sl-dropdown` where a `keydown` listener wasn't cleaned up properly
 - Fixed a bug in `sl-select` where no selection with `multiple` resulted in an incorrect value [#457](https://github.com/shoelace-style/shoelace/issues/457)
 - Fixed a bug in `sl-select` where `sl-change` was emitted immediately after connecting to the DOM [#458](https://github.com/shoelace-style/shoelace/issues/458)
 

src/components/dropdown/dropdown.ts

@@ -392,7 +392,7 @@ export default class SlDropdown extends LitElement {
       this.slHide.emit();
       this.panel.removeEventListener('sl-activate', this.handleMenuItemActivate);
       this.panel.removeEventListener('sl-select', this.handlePanelSelect);
-      document.addEventListener('keydown', this.handleDocumentKeyDown);
+      document.removeEventListener('keydown', this.handleDocumentKeyDown);
       document.removeEventListener('mousedown', this.handleDocumentMouseDown);
 
       await stopAnimations(this);