openAllSections
Description
打开当前活动视图中的所有 section（仅当视图为 Timeline 且处于"Tree"模式时有效；否则，该方法将被忽略）
openAllSections: () => void
Example
scheduler.openAllSections();
Applicable views: Timeline view
Details
注释
此方法需要启用 treetimeline 插件。
注释
此方法仅适用于 Tree 模式
Related API
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