src/vs/workbench/services/themes/browser/workbenchThemeService.ts/WorkbenchThemeService/restoreColorTheme
class WorkbenchThemeService:	public async restoreColorTheme(): Promise<boolean> {
		return this.colorThemeSequencer.queue(async () => {
			const settingId = this.settings.colorTheme;
			const theme = this.colorThemeRegistry.findThemeBySettingsId(settingId);
			if (theme) {
				if (settingId !== this.currentColorTheme.settingsId) {
					await this.internalSetColorTheme(theme.id, undefined);
				} else if (theme !== this.currentColorTheme) {
					await theme.ensureLoaded(this.extensionResourceLoaderService);
					theme.setCustomizations(this.settings);
					await this.applyTheme(theme, undefined, true);
				}
				return true;
			}
			return false;
		});
	}