And here's a video from today where I have rudimentary hover tracking (frame bulk closest to the cursor) and coloring (all frames of the hovered frame bulk turn green).
This time I decided to try implementing drawing with a simple "render list" thing: one function returns "draw line from here to here in this color" commands, and another runs over them and calls OpenGL. The first function is completely side-effect-free and can be easily subjected to testing!
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