src/vs/workbench/services/themes/browser/workbenchThemeService.ts/WorkbenchThemeService/restoreFileIconTheme
class WorkbenchThemeService:	public async restoreFileIconTheme(): Promise<boolean> {
		return this.fileIconThemeSequencer.queue(async () => {
			const settingId = this.settings.fileIconTheme;
			const theme = this.fileIconThemeRegistry.findThemeBySettingsId(settingId);
			if (theme) {
				if (settingId !== this.currentFileIconTheme.settingsId) {
					await this.internalSetFileIconTheme(theme.id, undefined);
				} else if (theme !== this.currentFileIconTheme) {
					await theme.ensureLoaded(this.fileIconThemeLoader);
					this.applyAndSetFileIconTheme(theme, true);
				}
				return true;
			}
			return false;
		});
	}