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Being able to easily set the number of repeats has been a request for the animation framework for some time now. The usual way to implement this is: connect to the ::completed signal, use a static counter, and stop the timeline when the counter hits a specific spot. In the same light as the :auto-reverse property, we can make it easier to implement this common functionality by adding a :repeat-count property that, when set, limits the amount of loops that a Timeline can perform before stopping itself. In fact, we can implement the :loop property in terms of the :repeat-count property just by using a sentinel value mapping to "infinity", and map loop=FALSE to repeat-count=0, and loop=TRUE to repeat-count=-1.
