C++ Smooth scrolling on imgui

[twenttyhvh]

So i tried to do smooth scrolling in imgui many times and i never got it, does anyone know how to do it correctly?
Once I achieved something similar but the speed was always the same using this code

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I understand that it is modifying ImGui::UpdateMouseWheel in imgui.cpp but honestly I don't understand how.
Cheers.

 

[BebeRexha]

its just a simple math formula with some logical checks, its easy to do (30-40 lines of code)