The tab template uses the qualify macro to generate a state tiddler title for each dropdown. The qualify macro combines all the values of the variable “transclusion” found in its chain of ancestors. This uniquely identifies the location of the qualify macro within the widget tree, ensuring that the generated state title is unique.
The “transclusion” variable is set by the transclude widget, which is generally enough to ensure uniqueness. In this case we introduce another assignment to the “transclusion” variable to ensure that the chain is uniquified by the title of the tiddler in the timeline.
Best wishes
Jeremy.