need some code comment

[Demir-Fes]

I examine Sequencer and your idea is truly inspirational for me.

I try to understand some hard-codded values and ImGui uses. Some explanatory comment would be great.

to understand your logic and learn some ImGui... I tried to replace this logic: for (int i = 0; i <= sequence->frame_count; i += frameStep) with this: for (int i = first_visible_frame; i <= last_visible_frame; i += frameStep)

I am not good at ImGui so it was hard and time-consuming work for me. Thank you.