src/vs/workbench/services/editor/browser/editorService.ts/EditorService/onConfigurationUpdated
class EditorService:	private onConfigurationUpdated(configuration: IWorkbenchEditorConfiguration): void {
		if (typeof configuration.workbench?.editor?.closeOnFileDelete === 'boolean') {
			this.closeOnFileDelete = configuration.workbench.editor.closeOnFileDelete;
		} else {
			this.closeOnFileDelete = false; // default
		}
	}