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Returns true if the instance is resolved. In the case of TJamItemIdList this means that an ItemIdList that was created with a path has already been accessed.
function IsResolved: Boolean;
True if the instance is resolved, false otherwise.
ItemIdLists are resolved automatically e.g. by calling IsInvalid. However depending on the element this might take a very long time, and cause freezes if done in the main thread.