bugfix: fix a first-frame crash in sliders
Doesn't affect Carousel, but user programs might run into it.
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@ -1,4 +1,5 @@
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update_sliders = function(State, x)
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if State.slider_handlers == nil then return end -- very first frame
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for name, slider in pairs(State.slider_handlers) do
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if State.selected_slider == name then
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slider.update(slider_value(slider, x))
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