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Saw this issue asking for a way to get the frame count for an Animation or Marquee widget #823
Looks like that's defined for all widgets (and is 1 in case it's not animated). This just updates the template for the render module to expose it as a readonly method, following the way size() is available for Text widgets.
Added test cases. Also checked that it gives a sensible answer for marquees in particular, which gets longer as the text gets longer.