actions.css

/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

.monaco-workbench .quick-input-list .quick-input-list-entry.has-actions:hover .quick-input-list-entry-action-bar .action-label.dirty-window::before,
.monaco-workbench .quick-input-list .quick-input-list-entry.has-actions:hover .quick-input-list-entry-action-bar .action-label.active-window::before {
	/* Close icon flips between black dot and "X" for dirty open editors and active window */
	content: var(--vscode-icon-x-content);
	font-family: var(--vscode-icon-x-font-family);
}