src/vs/workbench/contrib/themes/browser/themes.contribution.ts/MarketplaceThemesPicker/dispose
class MarketplaceThemesPicker:	public dispose() {
		if (this._tokenSource) {
			this._tokenSource.cancel();
			this._tokenSource = undefined;
		}
		this._queryDelayer.dispose();
		this._marketplaceExtensions.clear();
		this._marketplaceThemes.length = 0;
	}