Currently Styler.clear() will clear the styles built up with the apply aaplymap and where method. It will clear class from the set_td_classes method and it will clear tooltips set with set_tooltips.

It does not clear table styles, and it does not clear formats. It does not reset hidden index or hidden columns.

Thoughts and PR into what this should do and how it should it be docum

OkDownload Version

1.0.5

Problem Describe

判断任务是否在运行的代码：

public synchronized boolean isRunning(DownloadTask task) {
        Util.d(TAG, "isRunning: " + task.getId());
        for (DownloadCall call : runningSyncCalls) {
            if (call.isCanceled()) continue;
            if (call.equalsTask(task)) {
                return true;
            }
        }