:japanese_goblin:SelectBox Custom: Hide Drop-down on Dispose. Fixes: #40962 (#40974)

SelectBox Custom: Hide Drop-down on Dispose.  Fixes: #40962 

src/vs/base/browser/ui/selectBox/selectBoxCustom.ts

@@ -675,6 +675,7 @@ export class SelectBoxList implements ISelectBoxDelegate, IDelegate<ISelectOptio
 	}
 
 	public dispose(): void {
+		this.hideSelectDropDown(false);
 		this.toDispose = dispose(this.toDispose);
 	}
 }