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Fix

I fixed the error that were happening when the cover had a certain amount of elements.

Problems

The fix itself was very easy to do, but doing it in a readable or without using 10 lines of code (i want things concise) was way harder than i expected. So i spent this entire time trying different ways to do it, each of them making everything worse.

Reasoning

The bug were with less than 14 elements, the script were calculating the first and last element index, it happened that these elements were behind the screen focus. Why? Because the values that the system was using were leaving these values, so i had to fix the way it was calculating things.